OCCUPATIONAL HEALTH & REHABILITATION INC
SC 13D, 1996-11-19
PHARMACEUTICAL PREPARATIONS
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<PAGE>

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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934
                               (Amendment No. __)*

                    Occupational Health + Rehabilitation Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                                  Common Stock
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   674617 10 5
                ------------------------------------------------
                                 (CUSIP Number)


 Kimberley A. Rummelsburg, Venrock Associates, 56th Floor, 30 Rockefeller Plaza,
                       New York, NY 10112, (212)649-5600
- --------------------------------------------------------------------------------
           (Name, Address and Telephone Number of Person Authorized to
                      Receive Notices and Communications)

                                November 6, 1996
                ------------------------------------------------
             (Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box /_/.

Check the following box if a fee is being paid with the statement /_/. (A fee
is not required only if the reporting person: (1) has a previous statement on
file reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class.)
(See Rule 13d-7.)


Note: Six copies of this statement, including all exhibits, should be filed with
the Commission. See Rule 13d-1(a) for other parties to whom copies are to be
sent.

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).

                            Exhibit Index on Page 19
                                 Total Pages 70

<PAGE>

                                  SCHEDULE 13D

- -----------------------------              ------------------------------------
CUSIP No.   674 617 10 5                            Page 2 of 70 Pages
- -----------------------------              ------------------------------------

- --------------------------------------------------------------------------------
 1  NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      Venrock Associates
      I.R.S. # 13-6300995
- --------------------------------------------------------------------------------
 2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                    (a) /X/
                                                                         (b) /_/
- --------------------------------------------------------------------------------
 3  SEC USE ONLY
- --------------------------------------------------------------------------------
 4  SOURCE OF FUNDS*
      WC
- --------------------------------------------------------------------------------
 5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED 
    PURSUANT TO ITEMS 2(d) or 2(e)                                           /_/
- --------------------------------------------------------------------------------
 6  CITIZENSHIP OR PLACE OF ORGANIZATION
      New York, U.S.A.
- --------------------------------------------------------------------------------
                  7  SOLE VOTING POWER
   NUMBER OF           None
    SHARES       ---------------------------------------------------------------
 BENEFICIALLY     8  SHARED VOTING POWER
   OWNED BY            55,316 shares (121,983 shares upon conversion of 
     EACH              preferred stock)
   REPORTING     ---------------------------------------------------------------
    PERSON        9  SOLE DISPOSITIVE POWER
     WITH              None
                 ---------------------------------------------------------------
                 10  SHARED DISPOSITIVE POWER
                       55,316 shares (121,983 shares upon conversion of 
                       preferred stock)

- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      55,316 shares (121,983 shares upon conversion of preferred stock)
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*   /_/
      Not Applicable
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
      3.8% (8.0% upon conversion of preferred stock)
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*
      PN
- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
             (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE
                                  ATTESTATION.


<PAGE>

                                  SCHEDULE 13D

- -----------------------------              ------------------------------------
CUSIP No.   674 617 10 5                            Page 3 of 70 Pages
- -----------------------------              ------------------------------------

- --------------------------------------------------------------------------------
 1  NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      Venrock Associates II, L.P.
      I.R.S. # 13-3844754
- --------------------------------------------------------------------------------
 2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                    (a) /X/
                                                                         (b) /_/
- --------------------------------------------------------------------------------
 3  SEC USE ONLY
- --------------------------------------------------------------------------------
 4  SOURCE OF FUNDS*
      WC
- --------------------------------------------------------------------------------
 5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED 
    PURSUANT TO ITEMS 2(d) or 2(e)                                           /_/
- --------------------------------------------------------------------------------
 6  CITIZENSHIP OR PLACE OF ORGANIZATION
      New York, U.S.A.
- --------------------------------------------------------------------------------
                  7  SOLE VOTING POWER
   NUMBER OF           None
    SHARES       ---------------------------------------------------------------
 BENEFICIALLY     8  SHARED VOTING POWER
   OWNED BY            24,801 shares (124,801 shares upon conversion of 
     EACH              preferred stock)
   REPORTING     ---------------------------------------------------------------
    PERSON        9  SOLE DISPOSITIVE POWER
     WITH              None
                 ---------------------------------------------------------------
                 10  SHARED DISPOSITIVE POWER
                       24,801 shares (124,801 shares upon conversion of 
                       preferred stock)

- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      24,801 shares (124,801 shares upon conversion of preferred stock)
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*   /_/
      Not Applicable
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
      1.7% (8.0% upon conversion of preferred stock)
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*
      PN
- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
             (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE
                                  ATTESTATION.


<PAGE>

                                  SCHEDULE 13D

- -----------------------------              ------------------------------------
CUSIP No.   674 617 10 5                            Page 4 of 70 Pages
- -----------------------------              ------------------------------------

- --------------------------------------------------------------------------------
 1  NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      Peter O. Crisp
      ###-##-####
- --------------------------------------------------------------------------------
 2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                    (a) /X/
                                                                         (b) /_/
- --------------------------------------------------------------------------------
 3  SEC USE ONLY
- --------------------------------------------------------------------------------
 4  SOURCE OF FUNDS*
      WC
- --------------------------------------------------------------------------------
 5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED 
    PURSUANT TO ITEMS 2(d) or 2(e)                                           /_/
- --------------------------------------------------------------------------------
 6  CITIZENSHIP OR PLACE OF ORGANIZATION
      U.S.A.
- --------------------------------------------------------------------------------
                  7  SOLE VOTING POWER
   NUMBER OF           None
    SHARES       ---------------------------------------------------------------
 BENEFICIALLY     8  SHARED VOTING POWER
   OWNED BY            80,116 shares (246,684 shares upon conversion of 
     EACH              preferred stock)
   REPORTING     ---------------------------------------------------------------
    PERSON        9  SOLE DISPOSITIVE POWER
     WITH              None
                 ---------------------------------------------------------------
                 10  SHARED DISPOSITIVE POWER
                       80,116 shares (246,684 shares upon conversion of 
                       preferred stock)

- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      80,116 shares (246,684 shares upon conversion of preferred stock)
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*   /_/
      Not Applicable
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
      5.5% (15.1% upon conversion of preferred stock)
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*
      IN
- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
             (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE
                                  ATTESTATION.


<PAGE>

                                  SCHEDULE 13D

- -----------------------------              ------------------------------------
CUSIP No.   674 617 10 5                            Page 5 of 70 Pages
- -----------------------------              ------------------------------------

- --------------------------------------------------------------------------------
 1  NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      Anthony B. Evnin
      ###-##-####
- --------------------------------------------------------------------------------
 2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                    (a) /X/
                                                                         (b) /_/
- --------------------------------------------------------------------------------
 3  SEC USE ONLY
- --------------------------------------------------------------------------------
 4  SOURCE OF FUNDS*
      WC
- --------------------------------------------------------------------------------
 5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED 
    PURSUANT TO ITEMS 2(d) or 2(e)                                           /_/
- --------------------------------------------------------------------------------
 6  CITIZENSHIP OR PLACE OF ORGANIZATION
      U.S.A.
- --------------------------------------------------------------------------------
                  7  SOLE VOTING POWER
   NUMBER OF           None
    SHARES       ---------------------------------------------------------------
 BENEFICIALLY     8  SHARED VOTING POWER
   OWNED BY            80,116 shares (246,684 shares upon conversion of 
     EACH              preferred stock)
   REPORTING     ---------------------------------------------------------------
    PERSON        9  SOLE DISPOSITIVE POWER
     WITH              None
                 ---------------------------------------------------------------
                 10  SHARED DISPOSITIVE POWER
                       80,116 shares (246,684 shares upon conversion of 
                       preferred stock)

- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      80,116 shares (246,684 shares upon conversion of preferred stock)
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*   /_/
      Not Applicable
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
      5.5% (15.1% upon conversion of preferred stock)
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*
      IN
- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
             (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE
                                  ATTESTATION.


<PAGE>

                                  SCHEDULE 13D

- -----------------------------              ------------------------------------
CUSIP No.   674 617 10 5                            Page 6 of 70 Pages
- -----------------------------              ------------------------------------

- --------------------------------------------------------------------------------
 1  NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      David R. Hathaway
      ###-##-####
- --------------------------------------------------------------------------------
 2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                    (a) /X/
                                                                         (b) /_/
- --------------------------------------------------------------------------------
 3  SEC USE ONLY
- --------------------------------------------------------------------------------
 4  SOURCE OF FUNDS*
      WC
- --------------------------------------------------------------------------------
 5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED 
    PURSUANT TO ITEMS 2(d) or 2(e)                                           /_/
- --------------------------------------------------------------------------------
 6  CITIZENSHIP OR PLACE OF ORGANIZATION
      U.S.A.
- --------------------------------------------------------------------------------
                  7  SOLE VOTING POWER
   NUMBER OF           None
    SHARES       ---------------------------------------------------------------
 BENEFICIALLY     8  SHARED VOTING POWER
   OWNED BY            80,116 shares (246,684 shares upon conversion of 
     EACH              preferred stock)
   REPORTING     ---------------------------------------------------------------
    PERSON        9  SOLE DISPOSITIVE POWER
     WITH              None
                 ---------------------------------------------------------------
                 10  SHARED DISPOSITIVE POWER
                       80,116 shares (246,684 shares upon conversion of 
                       preferred stock)

- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      80,116 shares (246,684 shares upon conversion of preferred stock)
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*   /_/
      Not Applicable
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
      5.5% (15.1% upon conversion of preferred stock)
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*
      IN
- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
             (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE
                                  ATTESTATION.

<PAGE>

                                  SCHEDULE 13D

- -----------------------------              ------------------------------------
CUSIP No.   674 617 10 5                            Page 7 of 70 Pages
- -----------------------------              ------------------------------------

- --------------------------------------------------------------------------------
 1  NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      Patrick F. Latterell
      ###-##-####
- --------------------------------------------------------------------------------
 2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                    (a) /X/
                                                                         (b) /_/
- --------------------------------------------------------------------------------
 3  SEC USE ONLY
- --------------------------------------------------------------------------------
 4  SOURCE OF FUNDS*
      WC
- --------------------------------------------------------------------------------
 5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED 
    PURSUANT TO ITEMS 2(d) or 2(e)                                           /_/
- --------------------------------------------------------------------------------
 6  CITIZENSHIP OR PLACE OF ORGANIZATION
      U.S.A.
- --------------------------------------------------------------------------------
                  7  SOLE VOTING POWER
   NUMBER OF           None
    SHARES       ---------------------------------------------------------------
 BENEFICIALLY     8  SHARED VOTING POWER
   OWNED BY            80,116 shares (246,684 shares upon conversion of 
     EACH              preferred stock)
   REPORTING     ---------------------------------------------------------------
    PERSON        9  SOLE DISPOSITIVE POWER
     WITH              None
                 ---------------------------------------------------------------
                 10  SHARED DISPOSITIVE POWER
                       80,116 shares (246,684 shares upon conversion of 
                       preferred stock)

- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      80,116 shares (246,684 shares upon conversion of preferred stock)
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*   /_/
      Not Applicable
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
      5.5% (15.1% upon conversion of preferred stock)
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*
      IN
- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
             (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE
                                  ATTESTATION.


<PAGE>

                                  SCHEDULE 13D

- -----------------------------              ------------------------------------
CUSIP No.   674 617 10 5                            Page 8 of 70 Pages
- -----------------------------              ------------------------------------

- --------------------------------------------------------------------------------
 1  NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      Ted H. McCourtney
      ###-##-####
- --------------------------------------------------------------------------------
 2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                    (a) /X/
                                                                         (b) /_/
- --------------------------------------------------------------------------------
 3  SEC USE ONLY
- --------------------------------------------------------------------------------
 4  SOURCE OF FUNDS*
      WC
- --------------------------------------------------------------------------------
 5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED 
    PURSUANT TO ITEMS 2(d) or 2(e)                                           /_/
- --------------------------------------------------------------------------------
 6  CITIZENSHIP OR PLACE OF ORGANIZATION
      U.S.A.
- --------------------------------------------------------------------------------
                  7  SOLE VOTING POWER
   NUMBER OF           None
    SHARES       ---------------------------------------------------------------
 BENEFICIALLY     8  SHARED VOTING POWER
   OWNED BY            80,116 shares (246,684 shares upon conversion of 
     EACH              preferred stock)
   REPORTING     ---------------------------------------------------------------
    PERSON        9  SOLE DISPOSITIVE POWER
     WITH              None
                 ---------------------------------------------------------------
                 10  SHARED DISPOSITIVE POWER
                       80,116 shares (246,684 shares upon conversion of 
                       preferred stock)

- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      80,116 shares (246,684 shares upon conversion of preferred stock)
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*   /_/
      Not Applicable
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
      5.5% (15.1% upon conversion of preferred stock)
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*
      IN
- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
             (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE
                                  ATTESTATION.


<PAGE>

                                  SCHEDULE 13D

- -----------------------------              ------------------------------------
CUSIP No.   674 617 10 5                            Page 9 of 70 Pages
- -----------------------------              ------------------------------------

- --------------------------------------------------------------------------------
 1  NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      Ray A. Rothrock
      ###-##-####
- --------------------------------------------------------------------------------
 2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                    (a) /X/
                                                                         (b) /_/
- --------------------------------------------------------------------------------
 3  SEC USE ONLY
- --------------------------------------------------------------------------------
 4  SOURCE OF FUNDS*
      WC
- --------------------------------------------------------------------------------
 5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED 
    PURSUANT TO ITEMS 2(d) or 2(e)                                           /_/
- --------------------------------------------------------------------------------
 6  CITIZENSHIP OR PLACE OF ORGANIZATION
      U.S.A.
- --------------------------------------------------------------------------------
                  7  SOLE VOTING POWER
   NUMBER OF           None
    SHARES       ---------------------------------------------------------------
 BENEFICIALLY     8  SHARED VOTING POWER
   OWNED BY            80,116 shares (246,684 shares upon conversion of 
     EACH              preferred stock)
   REPORTING     ---------------------------------------------------------------
    PERSON        9  SOLE DISPOSITIVE POWER
     WITH              None
                 ---------------------------------------------------------------
                 10  SHARED DISPOSITIVE POWER
                       80,116 shares (246,684 shares upon conversion of 
                       preferred stock)

- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      80,116 shares (246,684 shares upon conversion of preferred stock)
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*   /_/
      Not Applicable
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
      5.5% (15.1% upon conversion of preferred stock)
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*
      IN
- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
             (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE
                                  ATTESTATION.


<PAGE>

                                  SCHEDULE 13D

- -----------------------------              ------------------------------------
CUSIP No.   674 617 10 5                            Page 10 of 70 Pages
- -----------------------------              ------------------------------------

- --------------------------------------------------------------------------------
 1  NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      Kimberley A. Rummelsburg
      ###-##-####
- --------------------------------------------------------------------------------
 2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                    (a) /X/
                                                                         (b) /_/
- --------------------------------------------------------------------------------
 3  SEC USE ONLY
- --------------------------------------------------------------------------------
 4  SOURCE OF FUNDS*
      WC
- --------------------------------------------------------------------------------
 5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED 
    PURSUANT TO ITEMS 2(d) or 2(e)                                           /_/
- --------------------------------------------------------------------------------
 6  CITIZENSHIP OR PLACE OF ORGANIZATION
      U.S.A.
- --------------------------------------------------------------------------------
                  7  SOLE VOTING POWER
   NUMBER OF           None
    SHARES       ---------------------------------------------------------------
 BENEFICIALLY     8  SHARED VOTING POWER
   OWNED BY            80,116 shares (246,684 shares upon conversion of 
     EACH              preferred stock)
   REPORTING     ---------------------------------------------------------------
    PERSON        9  SOLE DISPOSITIVE POWER
     WITH              None
                 ---------------------------------------------------------------
                 10  SHARED DISPOSITIVE POWER
                       80,116 shares (246,684 shares upon conversion of 
                       preferred stock)

- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      80,116 shares (246,684 shares upon conversion of preferred stock)
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*   /_/
      Not Applicable
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
      5.5% (15.1% upon conversion of preferred stock)
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*
      IN
- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
             (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE
                                  ATTESTATION.


<PAGE>

                                  SCHEDULE 13D

- -----------------------------              ------------------------------------
CUSIP No.   674 617 10 5                            Page 11 of 70 Pages
- -----------------------------              ------------------------------------

- --------------------------------------------------------------------------------
 1  NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      Anthony Sun
      ###-##-####
- --------------------------------------------------------------------------------
 2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                    (a) /X/
                                                                         (b) /_/
- --------------------------------------------------------------------------------
 3  SEC USE ONLY
- --------------------------------------------------------------------------------
 4  SOURCE OF FUNDS*
      WC
- --------------------------------------------------------------------------------
 5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED 
    PURSUANT TO ITEMS 2(d) or 2(e)                                           /_/
- --------------------------------------------------------------------------------
 6  CITIZENSHIP OR PLACE OF ORGANIZATION
      U.S.A.
- --------------------------------------------------------------------------------
                  7  SOLE VOTING POWER
   NUMBER OF           None
    SHARES       ---------------------------------------------------------------
 BENEFICIALLY     8  SHARED VOTING POWER
   OWNED BY            80,116 shares (246,684 shares upon conversion of 
     EACH              preferred stock)
   REPORTING     ---------------------------------------------------------------
    PERSON        9  SOLE DISPOSITIVE POWER
     WITH              None
                 ---------------------------------------------------------------
                 10  SHARED DISPOSITIVE POWER
                       80,116 shares (246,684 shares upon conversion of 
                       preferred stock)

- --------------------------------------------------------------------------------
11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      80,116 shares (246,684 shares upon conversion of preferred stock)
- --------------------------------------------------------------------------------
12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*   /_/
      Not Applicable
- --------------------------------------------------------------------------------
13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
      5.5% (15.1% upon conversion of preferred stock)
- --------------------------------------------------------------------------------
14  TYPE OF REPORTING PERSON*
      IN
- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
             (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE
                                  ATTESTATION.


<PAGE>

Note: Prior to the filing of this Statement on Schedule 13D (the "Statement"),
Venrock, Venrock II and the General Partners (each, as defined below) filed a
Statement on Schedule 13G, as amended (the "13G Statement"), with respect to the
Common Stock, par value $.001 per share (the "Common Stock"), of Occupational
Health & Rehabilitation Inc. (formerly Telor Ophthalmic Pharmaceuticals, Inc.),
a Delaware Corporation (the "Company").

Item 1.  Security and Issuer

         This Statement relates to the Common Stock of Occupational Health +
Rehabilitation Inc. The principal executive offices of the Company are located
at 175 Derby Street, Suite 36, Hingham, Massachusetts 02043.

Item 2.  Identity and Background

         (a) - (c) This Statement is filed by Venrock Associates, a limited
partnership organized in the State of New York ("Venrock"), and Venrock II,
L.P., a limited partnership organized in the State of New York ("Venrock II"),
and Peter O. Crisp, Anthony B. Evnin, David R. Hathaway, Patrick F. Latterell,
Ted H. McCourtney, Ray A. Rothrock, Kimberley A. Rummelsburg and Anthony Sun,
each of whom is a general partner of both Venrock and Venrock II (each, a
"General Partner"; and together the "General Partners").

         Venrock's principal business is venture capital investment. Venrock's
principal business and office address is Room 5508, 30 Rockefeller Plaza, New
York, New York 10112.

         Venrock II's principal business is venture capital investment. Venrock
II's principal business and office address is Room 5508, 30 Rockefeller Plaza,
New York, New York 10112.

         (d) - (e) None.

         (f) U.S.A.

Item 3.  Source and Amount of Funds or Other Consideration

         The acquisitions by Venrock and Venrock II of the Common Stock of the
Company were previously disclosed on the 13G Statement.

         On November 6, 1996, Venrock acquired 66,667 shares of Series A
Convertible Preferred Stock of the Company (the "Preferred Stock") pursuant to
the Series A Convertible Preferred Stock Purchase Agreement dated November 6,
1996 (the "Purchase Agreement") by and among the Company, Venrock, Venrock II
and other purchasers specified therein (each, a "Purchaser"; and together with
Venrock, the


                                  Page 12 of 70
<PAGE>

"Purchasers") for $400,002, which funds were obtained from Venrock's available

cash.

         On November 6, 1996, Venrock II acquired 100,000 shares of Preferred
Stock pursuant to the Purchase Agreement for $600,000, which funds were obtained
from Venrock's II's available cash.

         In the event Venrock or Venrock II exercise their respective options to
purchase Additional Shares (as defined below), Venrock and Venrock II will
acquire the Additional Shares from their available cash.

Item 4.  Purpose of Transaction

         Venrock and Venrock II purchased the Common Stock and Preferred Stock
from the Company as an investment, and hold the Common Stock and the Preferred
Stock in the ordinary course of business. Venrock and Venrock II intend to
review their positions with respect to converting their shares of Preferred
Stock on a regular basis and as a result thereof, may, at any time or from time
to time, subject to the terms and conditions of the Preferred Stock, convert
their shares of Preferred Stock into shares of Common Stock.

         Each share of Preferred Stock may be converted into such number of
shares of Common Stock as is obtained by (i) multiplying the number of shares of
Preferred Stock to be converted by $6.00 and (ii) dividing the result by the
conversion price of $6.00 per share or in case an adjustment of such price has
taken place, then by the conversion price as last adjusted, at any time at the
election of a holder of Preferred Stock. Pursuant to the Purchase Agreement,
1,416,667 shares of the Preferred Stock were sold to the Purchasers.

         Pursuant to Article I of the Purchase Agreement and subject to certain
conditions in the Purchase Agreement, the Company may, with the written consent
of a majority in interest of the Purchasers, upon 10 days' notice given prior to
May 6, 1997, offer to the Purchasers the option to purchase additional shares of
Preferred Stock (the "Additional Shares"). In such event, Venrock and Venrock II
will have the option to purchase 11,800 Additional Shares and 17,700 Additional
Shares, respectively, subject to adjustment as provided in the Purchase
Agreement. A copy of the Purchase Agreement filed as Exhibit 2 to this Statement
is incorporated herein by reference.

         For information regarding the Stockholders' Agreement, dated November
6, 1996, by and among the Company and the other parties specified therein (the
"Stockholders' Agreement") which is incorporated in this Item 4 by reference,
see Item 6.


                                  Page 13 of 70
<PAGE>

         Except as set forth above, Venrock, Venrock II and the General Partners
have no plans or proposals which relate to or would result in the types of
transactions or events set forth in subparagraphs (a) through (j) of this Item
4.

Item 5.  Interest in Securities of the Issuer


         (a) As of the date hereof, Venrock beneficially owns 55,316 shares of
the Common Stock, representing approximately 3.8% of the issued and outstanding
shares of the Common Stock. However, if the conversion rights with respect to
the Preferred Stock owned by Venrock were exercised in full, Venrock would
beneficially own 121,983 shares of the Common Stock, representing approximately
8.0% of the issued and outstanding shares of the Common Stock.

         As of the date hereof, Venrock II beneficially owns 24,801 shares of
Common Stock, representing 1.7% of the issued and outstanding shares of Common
Stock. However, if the conversion rights with respect to the Preferred Stock
were exercised in full, Venrock II would beneficially own 124,801 shares of
Common Stock, representing approximately 8.0% of the issued and outstanding
shares of Common Stock.

         Mr. Crisp beneficially owns an aggregate of 80,117 shares of Common
Stock, representing approximately 5.5% of the issued and outstanding shares of
Common Stock. However, if the conversion rights with respect to the Preferred
Stock owned by Venrock and Venrock II were exercised in full, Mr. Crisp would
beneficially own 246,684 shares of Common Stock, representing approximately
15.1% of the issued and outstanding shares of Common Stock.

         Mr. Evnin beneficially owns an aggregate of 80,117 shares of Common
Stock, representing approximately 5.5% of the issued and outstanding shares of
Common Stock. However, if the conversion rights with respect to the Preferred
Stock owned by Venrock and Venrock II were exercised in full, Mr. Evnin would
beneficially own 246,684 shares of Common Stock, representing approximately
15.1% of the issued and outstanding shares of Common Stock.

         Mr. Hathaway beneficially owns an aggregate of 80,117 shares of Common
Stock, representing approximately 5.5% of the issued and outstanding shares of
Common Stock. However, if the conversion rights with respect to the Preferred
Stock owned by Venrock and Venrock II were exercised in full, Mr. Hathaway would
beneficially own 246,684 shares of Common Stock, representing approximately
15.1% of the issued and outstanding shares of Common Stock.

         Mr. Latterell beneficially owns an aggregate of 80,117 shares of Common
Stock, representing approximately 5.5% of the issued and outstanding shares of
Common Stock. However, if the conversion rights with respect to the Preferred
Stock owned by Venrock and Venrock II were exercised in full, Mr. Latterell
would beneficially own


                                  Page 14 of 70
<PAGE>

246,684 shares of Common Stock, representing approximately 15.1% of the issued
and outstanding shares of Common Stock.

         Mr. McCourtney beneficially owns an aggregate of 80,117 shares of
Common Stock, representing approximately 5.5% of the issued and outstanding
shares of Common Stock. However, if the conversion rights with respect to the
Preferred Stock owned by Venrock and Venrock II were exercised in full, Mr.
McCourtney would beneficially own 246,684 shares of Common Stock, representing
approximately 15.1% of the issued and outstanding shares of Common Stock.


         Mr. Rothrock beneficially owns an aggregate of 80,117 shares of Common
Stock, representing approximately 5.5% of the issued and outstanding shares of
Common Stock. However, if the conversion rights with respect to the Preferred
Stock owned by Venrock and Venrock II were exercised in full, Mr. Rothrock would
beneficially own 246,684 shares of Common Stock, representing approximately
15.1% of the issued and outstanding shares of Common Stock.

         Ms. Rummelsburg beneficially owns an aggregate of 80,117 shares of
Common Stock, representing approximately 5.5% of the issued and outstanding
shares of Common Stock. However, if the conversion rights with respect to the
Preferred Stock owned by Venrock and Venrock II were exercised in full, Ms.
Rummelsburg would beneficially own 246,684 shares of Common Stock, representing
approximately 15.1% of the issued and outstanding shares of Common Stock.

         Mr. Sun beneficially owns an aggregate of 80,117 shares of Common
Stock, representing approximately 5.5% of the issued and outstanding shares of
Common Stock. However, if the conversion rights with respect to the Preferred
Stock owned by Venrock and Venrock II were exercised in full, Mr. Sun would
beneficially own 246,684 shares of Common Stock, representing approximately
15.1% of the issued and outstanding shares of Common Stock.

         (b) Venrock and the General Partners have shared voting and shared
dispositive powers with respect to the shares of the Common Stock (i) owned by
Venrock and (ii) issuable to Venrock upon conversion of the Preferred Stock.

         Venrock II and the General Partners have shared voting and shared
dispositive powers with respect to the shares of the Common Stock (i) owned by
Venrock II and (ii) issuable to Venrock II upon conversion of the Preferred
Stock.

         For information regarding the Stockholders' Agreement covering the
Preferred Stock, see Item 6 below.

         (c) Except as disclosed in this Statement, Venrock, Venrock II and the
General Partners have not effected any transaction in the registered securities
of the Company during the past 60 days.


                                  Page 15 of 70
<PAGE>

         (d) No person, other than Venrock and the General Partners, has the
right to receive or the power to direct the receipt of dividends from, or the
proceeds from the sale of, the shares of Common Stock owned by Venrock.

         No person, other than Venrock II and the General Partners, has the
right to receive or the power to direct the receipt of dividends from, or the
proceeds from the sale of, the shares of Common Stock owned by Venrock II.

         (e) Not applicable.

Item 6.  Contracts, Arrangements, Understandings or
         Relationships with Respect to Securities of the

         Issuer

         Venrock and Venrock II acquired the Preferred Stock pursuant to the
Purchase Agreement which is described in Item 4 above. Pursuant to Article VI of
the Purchase Agreement, the Company has agreed with the Purchasers to not issue,
sell or exchange any (i) shares of Common Shock, (ii) any other equity security
of the Company, (iii) any debt security which by its terms is convertible into
or exchangeable for any equity security of the Company, (iv) any security of the
Company that is a combination of debt and equity or (v) any option, warrant or
other right to subscribe for, purchase or otherwise acquire any such debt or
equity security; which in any of the foregoing cases is at a price equal to or
less than the applicable "Series A Conversion Price" (as defined in paragraph 6
of the Company's Certificate of Designation), unless the Company shall have
first offered to sell such securities to the Purchasers. A copy of the Purchase
Agreement is filed herewith as Exhibit 2 to this Schedule 13D and is
incorporated herein by reference.

         In connection with the Purchase Agreement, the Company, the Purchasers
and certain other holders (the "Holders") of the Company's Common Stock (as
identified in the Stockholders' Agreement) entered into a Stockholders'
Agreement. Pursuant to Section 1 of the Stockholders' Agreement, the Purchasers
and the Holders agreed to vote all Stock (as defined in the Stockholders'
Agreement) currently owned or after acquired by such party to cause and maintain
the election to the Board of Directors of the following parties: (i) John C.
Garbarino, (ii) a person designated by the Telor Principal Stockholders (as
identified in the Stockholders' Agreement) by a majority of interest of Stock
held by them, (iii) a person designated by OH&R Principal Stockholders (as
identified in the Stockholders' Agreement) by a majority of interest of Stock
held by them, (iv) two persons designated by Cahill, Warnock Strategic Partners
Fund, L.P., and (v) two persons unaffiliated with the management of the Company
and mutually agreeable to all other directors. The Company has also agreed to
take all actions necessary to cause and maintain the Board of Directors as
described above. In addition, the Purchasers


                                  Page 16 of 70
<PAGE>

and the Holders agreed to vote all shares of Stock currently owned or after
acquired by such party so that the Company's Board of Directors shall consist of
no more than seven directors. A copy of the Stockholders' Agreement is filed
herewith as Exhibit 3 to this Schedule 13D and is incorporated herein by
reference.

Item 7.  Material to Be Filed as Exhibits

         1. Written Agreement of Venrock, Venrock II, Peter O. Crisp, Anthony B.
Evnin, David R. Hathaway, Patrick F. Latterell, Ted H. McCourtney, Ray A.
Rothrock, Kimberley A. Rummelsburg and Anthony Sun relating to the filing of
this Statement as required by Rule 13d-1(f).

         2. Series A Convertible Preferred Stock Purchase Agreement, dated
November 6, 1996, by and between the Company and the other parties specified
therein.


         3. Stockholders' Agreement, dated November 6, 1996, by and between the
Company and the other parties specified therein.

         4. Power of Attorney dated November 19, 1996.


                                  Page 17 of 70

<PAGE>

Signature

         After reasonable inquiry and to the best of our knowledge and belief,
we certify that the information set forth in this statement is true, complete
and correct.

                              Venrock Associates


November 19, 1996             By:       /s/ Ted H. McCourtney
                                  -------------------------------------
                                        Ted H. McCourtney
                                        General Partner


                              Venrock Associates II, L.P.


November 19, 1996             By:       /s/ Ted H. McCourtney
                                  -------------------------------------
                                        Ted H. McCourtney
                                        General Partner


November 19, 1996                       /s/ Peter O. Crisp
                                  -------------------------------------
                                        Peter O. Crisp
                                        General Partner


                                        /s/ Anthony B. Evnin
                                  -------------------------------------
                                        Anthony B. Evnin
                                        General Partner


                                        /s/ David R. Hathaway
                                  -------------------------------------
                                        David R. Hathaway
                                        General Partner


                                        /s/ Ted. H. McCourtney
                                  -------------------------------------
                                        Ted H. McCourtney
                                        General Partner


                                        /s/ Ray A. Rothrock
                                  -------------------------------------
                                        Ray A. Rothrock
                                        General Partner



                                        /s/ Kimberley A. Rummelsburg
                                  -------------------------------------
                                        Kimberley  A. Rummelsburg
                                        General Partner


                                        /s/ Patrick F. Latterell
                                  -------------------------------------
                                        Patrick F. Latterell
                                        General Partner


                                        /s/ Anthony Sun
                                  -------------------------------------
                                        Anthony Sun
                                        General Partner


                                  Page 18 of 70

<PAGE>

                                  EXHIBIT INDEX

   Exhibit
     No.                Document
   -------              --------

      1   Written Agreement of Venrock Associates,
          Venrock Associates II, L.P., Peter O. Crisp,
          Anthony B. Evnin, David R. Hathaway, Patrick
          F. Latterell, Ted H. McCourtney, Ray A.
          Rothrock, Kimberley A. Rummelsburg and
          Anthony Sun relating to the filing of this
          Amendment No. 2 to the Statement on Schedule
          13D as required by Rule 13d-1(f).

      2   Series A Convertible Preferred Stock and
          Warrant Purchase Agreement, dated November 6,
          1996 by and among the Company and the other
          parties specified therein.

      3   Stockholders' Agreement, dated May 9, 1995,
          by and among the Company and the other
          parties specified therein.

      4   Power of Attorney.


                                  Page 19 of 70


<PAGE>

                                    EXHIBIT 1


                                  Page 20 of 70


<PAGE>

                                    AGREEMENT

         Pursuant to Rule 13d-1(f) promulgated under the Securities Exchange Act
of 1934, as amended, each of the undersigned agree that the Schedule 13D, and
any amendments thereto, filed with respect to the beneficial ownership by the
undersigned of the equity securities of Occupational Health + Rehabilitation
Inc. is being filed on behalf of each of the undersigned. 


                              Venrock Associates


November 19, 1996             By:       /s/ Ted H. McCourtney
                                  -------------------------------------
                                        Ted H. McCourtney
                                        General Partner


                              Venrock Associates II, L.P.


November 19, 1996             By:       /s/ Ted H. McCourtney
                                  -------------------------------------
                                        Ted H. McCourtney
                                        General Partner


November 19, 1996                       /s/ Peter O. Crisp
                                  -------------------------------------
                                        Peter O. Crisp
                                        General Partner


                                        /s/ Anthony B. Evnin
                                  -------------------------------------
                                        Anthony B. Evnin
                                        General Partner


                                        /s/ David R. Hathaway
                                  -------------------------------------
                                        David R. Hathaway
                                        General Partner


                                        /s/ Ted. H. McCourtney
                                  -------------------------------------
                                        Ted H. McCourtney
                                        General Partner


                                        /s/ Ray A. Rothrock
                                  -------------------------------------
                                        Ray A. Rothrock
                                        General Partner



                                        /s/ Kimberley A. Rummelsburg
                                  -------------------------------------
                                        Kimberley  A. Rummelsburg
                                        General Partner


                                        /s/ Patrick F. Latterell
                                  -------------------------------------
                                        Patrick F. Latterell
                                        General Partner


                                  Page 21 of 70
<PAGE>


                                        /s/ Anthony Sun
                                  -------------------------------------
                                        Anthony Sun
                                        General Partner


                                  Page 22 of 70



<PAGE>


                                    EXHIBIT 2


                                  Page 23 of 70


<PAGE>

================================================================================


                    OCCUPATIONAL HEALTH + REHABILITATION INC

             Series A Convertible Preferred Stock Purchase Agreement




                          Dated as of November 6, 1996


================================================================================


                                  Page 24 of 70


<PAGE>

                                TABLE OF CONTENTS

                                                                     Page
                                                                     ----
ARTICLE I   PURCHASE, SALE AND TERMS OF SHARES..........................   28
                                                                           
      1.01  The Initial Preferred Shares................................   28
      1.02  The Additional Preferred Shares.............................   28
      1.03  The Converted Shares........................................   28
      1.04  The Shares..................................................   28
      1.05  Purchase Price and Closings.................................   29
      1.06  Use of Proceeds.............................................   29
                                                                           
ARTICLE II  CONDITIONS TO PURCHASERS' OBLIGATION........................   30
                                                                           
      2.01  Representations and Warranties..............................   30
      2.02  Documentation at Initial Closing............................   30
      2.03  Consents, Waivers, Etc......................................   34
      2.04  Conditions Precedent to Additional Closings.................   34
                                                                         
ARTICLE III REPRESENTATIONS AND WARRANTIES OF THE COMPANY...............   34
                                                                        
      3.01  Organization, Qualifications and Corporate Power............   35
      3.02  Authorization of Agreements, Etc............................   35
      3.03  Validity....................................................   36
      3.04  Authorized Capital Stock....................................   36
      3.05  Financial Statements........................................   37
      3.06  Events Subsequent to the Date of the Balance Sheet..........   37
      3.07  Litigation; Compliance with Law.............................   38
      3.08  Proprietary Information of Third Parties....................   38
      3.09  Patents, Trademarks, Etc....................................   39
      3.10  Title to Properties.........................................   39
      3.11  Leasehold Interests.........................................   39
      3.12  Insurance...................................................   40
      3.13  Taxes.......................................................   40
      3.14  Other Agreements............................................   40
      3.15  Loans and Advances..........................................   42
      3.16  Assumptions, Guaranties, Etc. of Indebtedness of Other   
              Persons ..................................................   42
      3.17  Significant Customers and Suppliers.........................   42
      3.18  Governmental Approvals......................................   42
      3.19  Disclosure..................................................   42
      3.20  Offering of the Purchased Shares............................   43
      3.21  Brokers.....................................................   43
      3.22  Officers....................................................   43
      3.23  Transactions With Affiliates................................   43
      3.24  Employees...................................................   43
      3.25  U.S. Real Property Holding Corporation......................   44
      3.26  Environmental Protection....................................   44
      3.27  ERISA.......................................................   44
      3.28  Foreign Corrupt Practices Act...............................   45
      3.29  Federal Reserve Regulations.................................   46

      3.30  Additional Information......................................   46
      3.31  Securities Act of 1933......................................   46


                                      Page 25 of 70    
<PAGE>

ARTICLE IV  COVENANTS OF THE COMPANY....................................   46
                                                                              
      4.01  Financial Statements, Reports, Etc..........................   46
      4.02  Reserve for Conversion Shares...............................   48
      4.03  Existence...................................................   48
      4.04  Properties, Business, Insurance.............................   48
      4.05  Inspection, Consultation and Advice.........................   48
      4.06  Restrictive Agreements Prohibited...........................   49
      4.07  Transactions with Affiliates................................   49
      4.08  Expenses of Directors.......................................   49
      4.09  Board of Directors Meetings.................................   49
      4.10  Compensation................................................   49
      4.11  By-laws.....................................................   49
      4.12  Reserved Employee Shares....................................   49
      4.13  Employee Confidentiality Agreements.........................   50
      4.14  Compliance with Laws........................................   50
      4.15  Keeping of Records and Books of Account.....................   50
      4.16  U.S. Real Property Interest Statement.......................   50
      4.17  Compensation and Audit Committees...........................   50
      4.18  Listing.....................................................   51
      4.19  Termination of Covenants....................................   51
                                                                           
ARTICLE V   REPRESENTATIONS, WARRANTIES AND COVENANTS OF                   
            THE PURCHASERS..............................................   51
                                                                           
ARTICLE VI  RIGHT OF FIRST REFUSAL......................................   52
                                                                           
      6.01  Right of First Refusal......................................   52
      6.02  Notice of Acceptance........................................   52
      6.03  Conditions to Acceptances and Purchase......................   53
      6.04  Further Sale................................................   53
      6.05  Exception...................................................   53
                                                                           
ARTICLE VII DEFINITIONS AND ACCOUNTING TERMS............................   54
                                                                           
      7.01  Certain Defined Terms.......................................   54
      7.02  Accounting Terms............................................   56
                                                                           
ARTICLE VIII MISCELLANEOUS..............................................   56
                                                                           
      8.01  No Waiver; Cumulative Remedies..............................   56
      8.02  Amendments, Waivers and Consents............................   56
      8.03  Addresses for Notices.......................................   57
      8.04  Costs, Expenses and Taxes...................................   57
      8.05  Binding Effect; Assignment..................................   57
      8.06  Survival of Representations and Warranties..................   57
      8.07  Prior Agreements............................................   57

      8.08  Severability................................................   58
      8.09  Governing Law...............................................   58
      8.10  Headings....................................................   58
      8.11  Counterparts................................................   58
      8.12  Further Assurances..........................................   58
                                                                           
                                                                           
                                  Page 26 of 70


<PAGE>

                    Occupational Health + Rehabilitation Inc
                           175 Derby Street, Suite 36
                        Hingham, Massachusetts 02043-5048

                             As of November 6, 1996

TO:   The Persons listed on Schedule I hereto

      Re:   Series A Convertible Preferred Stock

Ladies and Gentlemen:

      Occupational Health + Rehabilitation Inc, a Delaware corporation (the
"Company"), agrees with each of you as follows:

                                    ARTICLE I

                       PURCHASE, SALE AND TERMS OF SHARES

      1.01 The Initial Preferred Shares. The Company has authorized the issuance
and sale of 1,416,667 shares (the "Initial Preferred Shares") of its previously
authorized but unissued shares of Series A Convertible Preferred Stock, $.001
par value (the "Series A Preferred Stock") at a purchase price of $6.00 per
share to the persons (collectively, the "Purchasers" and, individually, a
"Purchaser") and in the respective amounts set forth in Schedule I hereto. The
designation, rights, preferences and other terms and conditions relating to the
Series A Preferred Stock shall be as set forth on Exhibit 1.01A hereto (the
"Certificate of Designations").

      1.02 The Additional Preferred Shares. Subject to the terms and conditions
hereof, the Company has authorized the issuance at an Additional Closing (as
hereinafter defined) of up to an additional 250,000 shares of Series A Preferred
Stock (said additional 250,000 shares of Series A Preferred Stock being
sometimes collectively referred to in this Agreement as the "Additional
Preferred Shares;" and the Initial Preferred Shares and the Additional Preferred
Shares being sometimes collectively referred to as the "Purchased Shares").

      1.03 The Converted Shares. The Company has authorized and has reserved and
covenants to continue to reserve, free of preemptive rights and other
preferential rights, a suffIcient number of its previously authorized but
unissued shares of Common Stock to satisfy the rights of conversion of the
holders of the Purchased Shares. Any shares of Common Stock issuable upon
conversion of the Purchased Shares, and such shares when issued, are herein
referred to as the "Converted Shares."

      1.04 The Shares. The Purchased Shares and the Converted Shares are
sometimes collectively referred to herein as the "Shares."


                                  Page 27 of 70
<PAGE>


      1.05  Purchase Price and Closings.

            (a) The Company agrees to issue and sell to the Purchasers and,
subject to and in reliance upon the representations, warranties, covenants,
terms and conditions of this Agreement, the Purchasers, severally but not
jointly, agree to purchase that number of the Initial Preferred Shares set forth
opposite their respective names in Schedule I. The aggregate purchase price of
the Initial Preferred Shares being purchased by each Purchaser is set forth
opposite such Purchaser's name in Schedule I. The initial purchase and sale
shall take place at a closing (the "Initial Closing") to be held at the offices
of Messrs. Testa, Hurwitz & Thibeault, LLP, High Street Tower, 125 High Street,
Boston, Massachusetts 02110, on November 6, 1996, at 10:00 A.M., or at such
other location, on such other date and at such time as may be mutually agreed
upon. At the Initial Closing, the Company will issue and deliver certificates
evidencing the Initial Preferred Shares to be sold at such Initial Closing to
each of the Purchasers (or its nominee) against payment of the full purchase
price therefor by wire transfer or check payable to the order of the Company.

            (b) The Additional Closing. Provided that the Company is not then in
default under this Agreement and subject to the provisions of Section 2.04, the
Company may, with the written consent of a majority in interest of the
Purchasers, upon not less than 10 days' notice given prior to May 6, 1997, offer
to the Purchasers the option to purchase, and each Purchaser may, at its option,
so purchase, subject to and in reliance upon the representations, warranties,
terms and conditions of this Agreement and upon the terms and conditions
hereinafter set forth, that number of Additional Preferred Shares set forth
opposite the name of such Purchaser on Schedule I attached hereto, under the
heading "Additional Preferred Shares." Any Additional Preferred Shares not
subscribed for by the Purchasers pursuant to the previous sentence (the
"Shortfall Shares") may be purchased by the Purchasers that did subscribe for
Additional Preferred Shares pursuant to the previous sentence (the
"Participating Purchasers"). Each Participating Purchaser shall have the right
to purchase up to that number of Shortfall Shares as shall be determined by
multiplying the total number of Shortfall Shares by a fraction the numerator of
which shall be the sum of the Initial Preferred Shares and the Additional
Preferred Shares subscribed for by such Participating Purchaser, and the
denominator of which shall be the total number of Initial Preferred Shares and
Additional Preferred Shares, in each case subscribed for by all such
Participating Purchasers. Any Shortfall Shares not so subscribed for pursuant to
this Section 1.05(b) shall be subscribed for by Cahill, Warnock Strategic
Partners Fund, L.P. and/or Strategic Associates, L.P. in proportions to be
determined in the sole discretion of Cahill, Warnock & Company, LLC. In the
event that the Shortfall Shares to be subscribed for by a Participating
Purchaser is determined to include fractional shares, such Participating
Purchaser shall be permitted to purchase the number of shares determined by
rounding such Participating Purchaser's allocated number of Shortfall Shares to
the nearest whole number. The per share purchase price for each such Additional
Preferred Share (as constituted on the date hereof) to be purchased pursuant to
this Agreement shall be $6.00. Such purchase and sale of Additional Preferred
Shares, if any, shall take place at a closing (the "Additional Closing") at the
offices of Testa, Hurwitz & Thibeault, LLP, High Street Tower, 125 High Street,
Boston, Massachusetts 02110, on such date or dates as the Company and the
Purchasers may agree, but in all events on or prior to May 6, 1997. At the
Additional Closing the Company will issue and deliver the certificates

evidencing the Additional Preferred Shares sold at such Additional Closing to
each of the Purchasers (or its nominee) against payment of the full purchase
price therefor by wire transfer or check payable to the order of the Company.

      1.06 Use of Proceeds. The Company shall use the proceeds from the sale of
the Purchased Shares for working capital and general corporate purposes.


                                  Page 28 of 70
<PAGE>

                                   ARTICLE II

                      CONDITIONS TO PURCHASERS' OBLIGATION

      The obligation of each Purchaser to purchase and pay for the Purchased
Shares to be purchased by it at the Initial Closing is subject to the following
conditions:

      2.01 Representations and Warranties. Each of the representations and
warranties of the Company set forth in Article III hereof shall be true and
correct on the date of the Initial Closing.

      2.02 Documentation at Initial Closing. The Purchasers shall have received
prior to or at the Initial Closing all of the following documents or
instruments, or evidence of completion thereof, each in form and substance
satisfactory to the Purchasers and their special counsel:

            (a) A copy of the Certificate of Incorporation of the Company,
      certified by the Secretary of State of the State of Delaware together with
      a certified copy of the Certificate of Designations, a copy of the
      resolutions of the Board of Directors and, if required, the stockholders
      of the Company evidencing the adoption of the Company's Certificate of
      Designations, the approval of this Agreement, the issuance of the
      Purchased Shares and the other matters contemplated hereby, and a copy of
      the By-laws of the Company, all of which shall have been certified by the
      Secretary of the Company to be true, complete and correct in every
      particular, and certified copies of all documents evidencing other
      necessary corporate or other action and governmental approvals, if any,
      with respect to this Agreement and the Shares.

            (b) The opinion of Shipman & Goodwin LLP, counsel to the Company,
      substantially to the effect that:

                  (i) The Company and its corporate subsidiary are corporations
            duly incorporated, validly existing and in good standing under the
            laws of their respective jurisdictions of incorporation. The
            Company's limited liability company subsidiary is a limited
            liability company duly organized, validly existing and in good
            standing under the laws of its jurisdiction of organization and is
            not licensed or qualified as a foreign limited liability company in
            any jurisdiction. To the knowledge of such counsel, Schedule III to
            this Agreement contains a complete list of all subsidiaries of the
            Company and the Company's equity interest therein. The Company is

            duly licensed or qualified to transact business as a foreign
            corporation and is in good standing in Massachusetts, Rhode Island,
            Vermont, Maine, New Jersey, New York, Pennsylvania and each other
            jurisdiction in which it owns or leases real property. Each of the
            Company and its subsidiaries has the corporate power or entity
            power, as the case may be, and authority to own and hold its
            properties and to carry on its business as currently conducted. The
            Company has the corporate power and authority to execute, deliver
            and perform this Agreement, the Registration Rights Agreement and
            the Stockholders' Agreement, to issue, sell and deliver the
            Purchased Shares and, upon conversion thereof, to issue and deliver
            the Converted Shares.

                  (ii) This Agreement, the Registration Rights Agreement and the
            Stockholders' Agreement have been duly authorized, executed and


                                  Page 29 of 70
<PAGE>

            delivered by the Company and constitute the legal, valid and binding
            obligations of the Company, enforceable in accordance with their
            respective terms (subject, as to enforcement of remedies, to the
            discretion of courts in awarding equitable relief and to applicable
            bankruptcy, reorganization, insolvency, moratorium and similar laws
            affecting the rights of creditors generally), except that such
            counsel need not express any opinion as to the validity or
            enforceability of the indemnification and contribution provisions of
            the Registration Rights Agreement.

                  (iii) The execution and delivery by the Company of this
            Agreement, the Registration Rights Agreement and the Stockholders'
            Agreement, the performance by the Company of its obligations
            hereunder and thereunder, the issuance, sale and delivery of the
            Purchased Shares and, upon conversion thereof, the issuance and
            delivery of the Converted Shares, will not violate any provision of
            law, the Charter or By-laws, as amended, of the Company, any order
            of any court or other agency of government or any indenture,
            agreement or other instrument known to such counsel to which the
            Company, its subsidiaries or any of their respective properties or
            assets is bound, or conflict with, result in a breach of or
            constitute (with due notice or lapse of time or both) a default
            under any such indenture, agreement or other instrument, or result
            in the creation or imposition of any lien, charge, restriction,
            claim or encumbrance of any nature whatsoever upon any of the
            properties or assets of the Company or its subsidiaries. In
            rendering the foregoing opinion, such counsel may assume full
            disclosure to the Purchasers of all material facts and, with respect
            to performance by the Company of its obligations under the
            Registration Rights Agreement, may assume compliance by the Company
            at such time with the registration requirements of the Securities
            Act and with applicable state securities laws and may disclaim any
            opinion as to the validity or enforceability of the indemnification
            and contribution provisions of the Registration Rights Agreement.


                  (iv) The authorized capital stock of the Company consists of
            (i) 5,000,000 shares of Preferred Stock, of which 1,666,667 shares
            have been designated Series A Convertible Preferred Stock, and (ii)
            10,000,000 shares of Common Stock. Immediately prior to the Closing,
            1,471,480 shares of Common Stock will be duly authorized, validly
            issued, fully paid and nonassessable with no personal liability
            attaching to the ownership thereof and no shares of Preferred Stock
            will have been issued. The designations, powers, preferences,
            rights, qualifications, limitations and restrictions in respect of
            each class or series of authorized capital stock of the Company are
            as set forth in the Charter, and all such designations, powers,
            preferences, rights, qualifications, limitations and restrictions
            are valid, binding and enforceable and in accordance with all
            applicable laws (subject, as to enforcement, to the discretion of
            courts in awarding equitable relief and to applicable bankruptcy,
            reorganization, insolvency, moratorium and similar laws affecting
            the rights of creditors generally). Except as set forth in Schedule
            IV, to the knowledge of such counsel, immediately prior to the
            Closing no subscription, warrant, option, convertible security, or
            other right (contingent or other) to purchase or acquire equity
            securities of the Company will be authorized or outstanding and
            there will be no commitment by the Company to issue shares,
            subscriptions, warrants, options, convertible securities, or other
            such rights


                                  Page 30 of 70
<PAGE>

            or to distribute to holders of any of its equity securities any
            evidence of indebtedness or asset. Except as set forth in Schedule
            IV or as provided for in the Charter, to the knowledge of such
            counsel the Company has no obligation (contingent or other) to
            purchase, redeem or otherwise acquire any of its equity securities
            or any interest therein or to pay any dividend or make any other
            distribution in respect thereof.

                  (v) The issuance, sale and delivery of the Purchased Shares
            and the issuance and delivery of the Converted Shares upon
            conversion of the Purchased Shares have been duly authorized by all
            required corporate action. Upon payment therefore in accordance with
            this Agreement, the Purchased Shares will have been validly issued,
            are fully paid and nonassessable with no personal liability
            attaching to the ownership thereof and, to the knowledge of such
            counsel, are free and clear of all liens, charges, restrictions,
            claims and encumbrances imposed by or through the Company except as
            set forth in the Registration Rights Agreement and the Stockholders'
            Agreement and as imposed by applicable federal and state securities
            laws; and the Converted Shares have been duly reserved for issuance
            upon conversion of the Purchased Shares and, when so issued, will be
            validly issued, fully paid and nonassessable with no personal
            liability attaching to the ownership thereof and, to the knowledge
            of such counsel, will be free and clear of all liens, charges,

            restrictions, claims and encumbrances imposed by or through the
            Company except as set forth in the Registration Rights Agreement and
            the Stockholders' Agreement and as imposed by applicable federal and
            state securities laws. Neither the issuance, sale or delivery of the
            Purchased Shares nor the issuance or delivery of the Converted
            Shares is subject to any preemptive right of stockholders of the
            Company arising under law or the Charter or By-laws of the Company,
            each as amended, or, to the knowledge of such counsel, to any
            contractual right of first refusal or other right in favor of any
            person.

                  (vi) Except as described in Schedule II, to the knowledge of
            such counsel there is no (A) action, suit, claim, proceeding or
            investigation pending or threatened against or affecting the Company
            or any of its subsidiaries, at law or in equity, or before or by any
            federal, state, municipal or other governmental department,
            commission, board, bureau, agency or instrumentality, domestic or
            foreign, (B) arbitration proceeding relating to the Company or any
            of its subsidiaries pending under collective bargaining agreements
            or (C) governmental inquiry pending or threatened against or
            affecting the Company or any of its subsidiaries (including, without
            limitation, any inquiry as to the qualification of the Company or
            any of its subsidiaries to hold or receive any license or permit).
            To the knowledge of such counsel, neither the Company nor any of its
            subsidiaries is in default with respect to any order, writ,
            injunction or decree known to such counsel of any court or of any
            federal, state, municipal or other governmental department,
            commission, board, bureau, agency or instrumentality, domestic or
            foreign.

                  (vii) Assuming the accuracy of the representations and
            warranties of the Purchasers set forth in Article III, no
            registration or filing with, and no consent or approval of, or other
            action by any federal, state or other governmental agency or
            instrumentality is or will be necessary for the


                                  Page 31 of 70



<PAGE>

            valid execution, delivery and performance by the Company of this
            Agreement, the Registration Rights Agreement and the Stockholders'
            Agreement, the issuance, sale and delivery of the Purchased Shares
            or, upon conversion thereof, the issuance and delivery of the
            Converted Shares, other than filings pursuant to state securities
            laws (all of which filings, other than those which are required to
            be made after the Closing, have been made by the Company). In
            rendering the foregoing opinion with respect to performance by the
            Company of its obligations under the Registration Rights Agreement,
            such counsel may assume compliance by the Company at such time with
            the registration requirements of the Securities Act and with

            applicable state securities laws and may disclaim any opinion as to
            the validity or enforceability of the indemnification and
            contribution provisions of the Registration Rights Agreement.

            (c) A certificate of the Secretary or an Assistant Secretary of the
      Company which shall certify the names of the officers of the Company
      authorized to sign this Agreement, the certificates for the Purchased
      Shares and the other documents, instruments or certificates to be
      delivered pursuant to this Agreement by the Company or any of its
      officers, together with the true signatures of such officers. The
      Purchasers may conclusively rely on such certificate until they shall
      receive a further certificate of the Secretary or an Assistant Secretary
      of the Company cancelling or amending the prior certificate and submitting
      the signatures of the officers named in such further certificate.

            (d) A certificate of the President of the Company stating that the
      representations and warranties of the Company contained in Article III
      hereof and otherwise made by the Company in writing in connection with the
      transactions contemplated hereby are true and correct and that all
      conditions required to be performed prior to or at the Initial Closing
      have been performed as of the Initial Closing.

            (e) The Restated Certificate of Incorporation of the Company (the
      "Charter") shall provide for the designation of the rights and preferences
      of the Series A Preferred Stock in the form set forth in Exhibit 1.01A
      attached hereto.

            (f) A Stockholders' Agreement in the form set forth in Exhibit 2.02F
      (the "Stockholders' Agreement") shall have been executed by the parties
      named therein.

            (g) Certificates of Good Standing for the Company from the
      Secretaries of State of Delaware, Massachusetts, Rhode Island, Vermont,
      Maine, New Jersey, New York, Pennsylvania and all other jurisdictions in
      which the Company is qualified to do business as a foreign corporation
      shall have been provided to the Purchasers and their special counsel.

            (h) Payment for the costs, expenses, taxes and filing fees
      identified in Section 8.04.

            (i) The Board of Directors of the Company following the Initial
      Closing shall consist of seven (7) members, of which the current members
      shall be: John C. Garbarino, Angus M. Duthie, Kevin J. Dougherty, John K.
      Herdklotz and Edward L. Cahill, with the remaining members to be
      designated in accordance with the Stockholders' Agreement.


                                  Page 32 of 70



<PAGE>

            (j) The Company and the Purchasers shall have entered into a

      Registration Rights Agreement in the form set forth in Exhibit 2.02J (the
      "Registration Rights Agreement").

            (k) The Company's By-laws shall be in form and substance reasonably
      satisfactory to the Purchasers and their special counsel.

            (l) Participation of all Purchasers specified on Schedule I hereto
      in the transactions.

      2.03 Consents, Waivers, Etc. Prior to the Initial Closing, the Company
shall have obtained all consents or waivers, if any, necessary to execute and
deliver this Agreement, issue the Initial Preferred Shares and to carry out the
transactions contemplated hereby and thereby, and all such consents and waivers
shall be in full force and effect. All corporate and other action and
governmental filings necessary to effectuate the terms of this Agreement, the
Initial Preferred Shares and other agreements and instruments executed and
delivered by the Company in connection herewith shall have been made or taken,
except for any post-sale filing that may be required under federal or state
securities laws. In addition to the documents set forth above, the Company shall
have provided to the Purchasers any other information or copies of documents
that they may reasonably request.

      2.04 Conditions Precedent to Additional Closings. The respective several
obligations of the Purchasers to purchase and pay for the Additional Preferred
Shares to be purchased at the Additional Closing are subject to (i) the written
consent of a majority in interest of the Purchasers, (ii) the continuing
performance in all material respects of all agreements by the Company contained
in this Agreement and the Stockholders' Agreement, and (iii) the delivery to
each Purchaser of a certificate, dated the date of such Additional Closing,
signed by the President of the Company, to the effect that (A) other than as
disclosed in a schedule, which shall be reasonably satisfactory to a majority in
interest of the Purchasers, attached to such certificate or as contemplated by
this Agreement, the representations and warranties of the Company contained in
Article III hereof were true and correct when made and are true and correct in
all material respects on and as of the date of such Additional Closing (it being
understood that, in the latter case, any reference to the Closing contained in
said Article III shall be deemed to be a reference to such Additional Closing),
(B) the Company has performed and complied in all material respects with all
covenants, agreements and conditions contained in this Agreement, the
Stockholders' Agreement and the Registration Rights Agreement required to be
performed or complied with by it on or prior to the date of the Additional
Closing, and (C) since the date of the Initial Closing, there has not occurred
(or is likely to occur) any material adverse event with respect to the Company
or its operations.

                                   ARTICLE III

                  REPRESENTATIONS AND WARRANTIES OF THE COMPANY

      The Company, together with its subsidiaries, represents and warrants to
the Purchasers that, except as set forth in the Disclosure Schedule attached as
Schedule II (which Disclosure Schedule makes explicit reference to the
particular representation or warranty as to which exception is taken, which in
each case shall constitute the sole representation and warranty as to which such

exception shall apply):


                                  Page 33 of 70



<PAGE>

      3.01  Organization, Qualifications and Corporate Power.

            (a) The Company is a corporation duly incorporated, validly existing
and in good standing under the laws of the State of Delaware and is duly
licensed or qualified to transact business as a foreign corporation and is in
good standing in each jurisdiction in which the nature of the business
transacted by it or the character of the properties owned or leased by it
requires such licensing or qualification and where the failure to be so
qualified would have a material adverse effect on the Company. The Company has
the corporate power and authority to own and hold its properties and to carry on
its business as now conducted and as proposed to be conducted, to execute,
deliver and perform this Agreement, the Registration Rights Agreement and the
Stockholders' Agreement to issue, sell and deliver the Preferred Shares and to
issue and deliver the Converted Shares.

            (b) The attached Schedule III contains a list of all subsidiaries of
the Company and its equity interest therein. Except for such subsidiaries, the
Company does not (i) own of record or beneficially, directly or indirectly, (A)
any shares of capital stock or securities convertible into capital stock of any
other corporation or (B) any participating interest in any partnership, joint
venture or other non-corporate business enterprise or (ii) control, directly or
indirectly, any other entity. Each of the Company's corporate subsidiary and
limited liability company subsidiary is a corporation or limited liability
company duly incorporated or organized, as the case may be, validly existing and
in good standing under the laws of its respective jurisdiction of incorporation
or organization, as the case may be, and is duly licensed or qualified to
transact business as a foreign corporation or limited liability company, as the
case may be, and is in good standing in each jurisdiction in which the nature of
the business transacted by it or the character of the properties owned or leased
by it requires such licensing or qualification and where the failure to be so
qualified would have a material adverse effect on the Company. Each of the
subsidiaries referenced above has the corporate power or entity power, as the
case may be, and authority to own and hold its properties and to carry on its
business as now conducted and as proposed to be conducted. All of the
outstanding shares of capital stock or equity interests, as the case may be, of
each of the subsidiaries are owned beneficially and of record by the Company,
one of its other subsidiaries, or any combination of the Company and/or one or
more of its other subsidiaries, in each case free and clear of any liens,
charges, restrictions, claims or encumbrances of any nature whatsoever; and
there are no outstanding subscriptions, warrants, options, convertible
securities, or other rights (contingent or other) pursuant to which any of the
subsidiaries is or may become obligated to issue any shares of its capital stock
or equity interests, as the case may be, to any person other than the Company or
one of the other subsidiaries.


      3.02  Authorization of Agreements, Etc.

            (a) The execution and delivery by the Company of this Agreement, the
Registration Rights Agreement and the Stockholders' Agreement, the performance
by the Company of its obligations hereunder and thereunder, the issuance, sale
and delivery of the Purchased Shares and the issuance and delivery of the
Converted Shares have been duly authorized by all requisite corporate action and
will not violate any provision of law, any order of any court or other agency of
government, the Charter or the By-laws of the Company, as amended, or any
provision of any indenture, agreement or other instrument to which the Company,
any of its subsidiaries or any of their respective properties or assets is
bound, or conflict with, result in a breach of or constitute (with due notice or
lapse of time or both) a default under any such indenture, agreement or other
instrument, or result in the creation or imposition of any lien, charge,
restriction, claim or encumbrance of any nature whatsoever upon any of the
properties or assets of the Company or any of its subsidiaries.


                                  Page 34 of 70

<PAGE>

To the best of the Company's knowledge, no provision of the Stockholders'
Agreement violates, conflicts with, results in a breach of or constitutes (with
due notice or lapse of time or both) a default by any other party under any
other indenture, agreement or instrument.

            (b) The Purchased Shares have been duly authorized and, when issued
in accordance with this Agreement, will be validly issued, fully paid and
nonassessable shares of Series A Preferred Stock with no personal liability
attaching to the ownership thereof and will be free and clear of all liens,
charges, restrictions, claims and encumbrances imposed by or through the Company
except as set forth in the Registration Rights Agreement and the Stockholders'
Agreement and as imposed by applicable federal and state securities laws. The
Converted Shares have been duly reserved for issuance upon conversion of the
Purchased Shares and, when so issued, will be duly authorized, validly issued,
fully paid and nonassessable shares of Common Stock with no personal liability
attaching to the ownership thereof and will be free and clear of all liens,
charges, restrictions, claims and encumbrances imposed by or through the Company
except as set forth in the Registration Rights Agreement and the Stockholders'
Agreement and as imposed by applicable federal and state securities laws.
Neither the issuance, sale or delivery of the Purchased Shares nor the issuance
or delivery of the Converted Shares is subject to any preemptive right of
stockholders of the Company or to any right of first refusal or other right in
favor of any person.

      3.03 Validity. This Agreement has been duly executed and delivered by the
Company and constitutes the legal, valid and binding obligation of the Company,
enforceable in accordance with its terms (subject, as to enforcement of
remedies, to applicable bankruptcy, reorganization, insolvency, moratorium and
similar laws affecting the rights of creditors generally). The Registration
Rights Agreement and the Stockholders' Agreement, when executed and delivered in
accordance with this Agreement, will constitute the legal, valid and binding
obligations of the Company, enforceable in accordance with their respective

terms (subject, as to enforcement of remedies, to applicable bankruptcy,
reorganization, insolvency, moratorium and similar laws affecting the rights of
creditors generally).

      3.04 Authorized Capital Stock. The authorized capital stock of the Company
consists of (i) 5,000,000 shares of Preferred Stock, $.001 par value (the
"Preferred Stock"), of which 1,666,667 shares have been designated Series A
Preferred Stock, and (ii) 10,000,000 shares of Common Stock. Immediately prior
to the Closing, 1,471,480 shares of Common Stock will be validly issued and
outstanding, fully paid and nonassessable with no personal liability attaching
to the ownership thereof and no shares of Preferred Stock will have been issued.
The stockholders of record owning more than 5% of the outstanding shares of the
Common Stock of the Company and holders of subscriptions, warrants, options,
convertible securities, and other rights (contingent or other) to purchase or
otherwise acquire equity securities of the Company, and the number of shares of
Common Stock and the number of such subscriptions, warrants, options,
convertible securities, and other such rights held by each, are as set forth in
the attached Schedule IV. The designations, powers, preferences, rights,
qualifications, limitations and restrictions in respect of each class and series
of authorized capital stock of the Company are as set forth in the Charter and
Certificate of Designations, a copy of which is attached as Exhibit 1.01A, and
all such designations, powers, preferences, rights, qualifications, limitations
and restrictions are valid, binding and enforceable and in accordance with all
applicable laws. Except as set forth in the attached Schedule IV, (i) no
subscription, warrant, option, convertible security, or other right (contingent
or other) to purchase or otherwise acquire equity securities of the Company is
authorized or outstanding and (ii) there is no commitment by the Company to
issue shares, subscriptions, warrants, options, convertible securities, or other
such rights or to distribute to holders of any of its equity securities any
evidence of indebtedness or asset. Except as provided for in the Charter or as
set forth in the attached Schedule IV, the Company has no


                                  Page 35 of 70
<PAGE>

obligation (contingent or other) to purchase, redeem or otherwise acquire any of
its equity securities or any interest therein or to pay any dividend or make any
other distribution in respect thereof. Except for the Stockholders' Agreement,
to the best of the Company's knowledge there are no voting trusts or agreements,
stockholders' agreements, pledge agreements, buy-sell agreements, rights of
first refusal, preemptive rights or proxies relating to any securities of the
Company or any of its subsidiaries (whether or not the Company or any of its
subsidiaries is a party thereto). All of the outstanding securities of the
Company were issued in compliance with all applicable federal and state
securities laws.

      3.05 Financial Statements. The Company has furnished to the Purchasers the
audited consolidated balance sheet of Telor Ophthalmic Pharmaceuticals, Inc.,
Occupational Health + Rehabilitation Inc and their subsidiaries (collectively,
the "Predecessor Companies") as of December 31, 1995 and the related audited
consolidated statements of income, stockholders' equity and cash flows of the
Predecessor Companies for the year ended December 31, 1995, the Unaudited Pro
Forma Combined Financial Information as of December 31, 1995 as disclosed in the

Offering Memorandum and Proxy Statement dated May 15, 1996 (the "Proxy
Statement"), the unaudited consolidated balance sheet of the Company and its
subsidiaries as of June 30, 1996 (the "Balance Sheet") and the related unaudited
consolidated statements of income, stockholders' equity and cash flows of the
Company and its subsidiaries for the 6 months ended June 30, 1996. All such
financial statements have been prepared in accordance with generally accepted
accounting principles consistently applied (except that such unaudited financial
statements do not contain all of the required footnotes and interim statements
do not contain year-end adjustments), or where different from generally accepted
accounting principles, SEC requirements, and fairly present the consolidated
financial position of the Predecessor Companies, the Company and its
subsidiaries as of December 31, 1995 and June 30, 1996, respectively, and the
consolidated results of their operations and cash flows of the Predecessor
Companies, the Company and its subsidiaries for the year ended December 31, 1995
and the 6 months ended June 30, 1996, respectively. Since the date of the
Balance Sheet, (i) there has been no change in the assets, liabilities or
financial condition of the Company and its subsidiaries (on a consolidated
basis) from that reflected in the Balance Sheet except for changes in the
ordinary course of business which in the aggregate have not been materially
adverse and (ii) none of the business, prospects, financial condition,
operations, property or affairs of the Company and its subsidiaries (on a
consolidated basis) has been materially adversely affected by any occurrence or
development, individually or in the aggregate, whether or not insured against.

      3.06 Events Subsequent to the Date of the Balance Sheet. Since the date of
the Balance Sheet, the Company has not (i) issued any stock, bond or other
corporate security, (ii) borrowed any amount or incurred or become subject to
any liability (absolute, accrued or contingent), except current liabilities
incurred and liabilities under contracts entered into in the ordinary course of
business, (iii) discharged or satisfied any lien or encumbrance or incurred or
paid any obligation or liability (absolute, accrued or contingent) other than
current liabilities shown on the Balance Sheet and current liabilities incurred
since the date of the Balance Sheet in the ordinary course of business, (iv)
declared or made any payment or distribution to stockholders or purchased or
redeemed any share of its capital stock or other security, (v) mortgaged,
pledged, encumbered or subjected to lien any of its assets, tangible or
intangible, other than liens of current real property taxes not yet due and
payable, (vi) sold, assigned or transferred any of its tangible assets except in
the ordinary course of business, or cancelled any debt or claim, (vii) sold,
assigned, transferred or granted any exclusive license with respect to any
patent, trademark, trade name, service mark, copyright, trade secret or other
intangible asset, (viii) suffered any loss of property or waived any right of
substantial value whether or not in the ordinary course of business, (ix) made
any change in officer compensation except in the ordinary course of business and
consistent with past


                                  Page 36 of 70
<PAGE>

practice, (x) made any material change in the manner of business or operations
of the Company, (xi) entered into any transaction except in the ordinary course
of business or as otherwise contemplated hereby or (xii) entered into any
commitment (contingent or otherwise) to do any of the foregoing.


      3.07 Litigation; Compliance with Law. There is no (i) action, suit, claim,
proceeding or investigation pending or, to the best of the Company's knowledge,
threatened against or affecting the Company, at law or in equity, or before or
by any federal, state, municipal or other governmental department, commission,
board, bureau, agency or instrumentality, domestic or foreign, (ii) arbitration
proceeding relating to the Company pending under collective bargaining
agreements or otherwise or (iii) governmental inquiry pending or, to the best of
the Company's knowledge, threatened against or affecting the Company (including,
without limitation, any inquiry as to the qualification of the Company to hold
or receive any license or permit), and, to the best of the Company's knowledge,
there is no basis for any of the foregoing. The Company has not received any
opinion or memorandum or legal advice from legal counsel to the effect that it
is exposed, from a legal standpoint, to any liability or disadvantage which may
be material to its business, prospects, financial condition, operations,
property or affairs. The Company is not in default with respect to any order,
writ, injunction or decree known to or served upon the Company of any court or
of any federal, state, municipal or other governmental department, commission,
board, bureau, agency or instrumentality, domestic or foreign. There is no
action or suit by the Company pending, or threatened or contemplated against
others. The Company has complied in all material respects with all laws, rules,
regulations and orders applicable to its business, operations, properties,
assets, products and services, the Company has all necessary permits, licenses
and other authorizations required to conduct its business as conducted and as
proposed to be conducted, and the Company has been operating its business
pursuant to and in compliance with the terms of all such permits, licenses and
other authorizations. There is no existing law, rule, regulation or order, and
the Company after due inquiry is not aware of any proposed law, rule, regulation
or order, whether federal, state, county or local, which would prohibit or
restrict the Company from, or otherwise materially adversely affect the Company
in, conducting its business in any jurisdiction in which it is now conducting
business or in which it proposes to conduct business.

      3.08 Proprietary Information of Third Parties. To the best of the
Company's knowledge, no third party has claimed or has reason to claim that any
person employed by or affiliated with the Company has (a) violated or may be
violating any of the terms or conditions of his or her employment,
non-competition or non-disclosure agreement with such third party, (b) disclosed
or may be disclosing or utilized or may be utilizing any trade secret or
proprietary information or documentation of such third party or (c) interfered
or may be interfering in the employment relationship between such third party
and any of its present or former employees. No third party has requested
information from the Company which suggests that such a claim might be
contemplated. To the best of the Company's knowledge, no person employed by or
affiliated with the Company has employed or proposes to employ any trade secret
or any information or documentation proprietary to any former employer, and to
the best of the Company's knowledge, no person employed by or affiliated with
the Company has violated any confidential relationship which such person may
have had with any third party, in connection with the development, manufacture
or sale of any product or proposed product or the development or sale of any
service or proposed service of the Company, and the Company has no reason to
believe there will be any such employment or violation. To the best of the
Company's knowledge, none of the execution or delivery of this Agreement, or the
carrying on of the business of the Company as officers, employees or agents by

any officer, director or key employee of the Company, or the conduct or proposed
conduct of the business of the Company, will conflict with or result in a breach
of the terms,


                                  Page 37 of 70
<PAGE>

conditions or provisions of or constitute a default under any contract, covenant
or instrument under which any such person is obligated.

      3.09 Patents, Trademarks, Etc. Set forth in Schedule II is a list and
brief description of all domestic and foreign patents, patent rights, patent
applications, trademarks, trademark applications, service marks, service mark
applications, trade names and registered copyrights, and all applications for
such which are in the process of being prepared, owned by or registered in the
name of the Company, or of which the Company is a licensor or licensee or in
which the Company has any right, and in each case a brief description of the
nature of such right. The Company owns or possesses adequate licenses or other
rights to use all patents, patent applications, trademarks, trademark
applications, service marks, service mark applications, trade names, copyrights,
manufacturing processes, formulae, trade secrets, customer lists and know how
(collectively, "Intellectual Property") necessary or desirable to the conduct of
its business as conducted and as proposed to be conducted, and no claim is
pending or, to the best of the Company's knowledge, threatened to the effect
that the operations of the Company infringe upon or conflict with the asserted
rights of any other person under any Intellectual Property, and, to the best of
the Company's knowledge, there is no basis for any such claim (whether or not
pending or threatened). No claim is pending or, to the best of the Company's
knowledge, threatened to the effect that any such Intellectual Property owned or
licensed by the Company, or which the Company otherwise has the right to use, is
invalid or unenforceable by the Company, and, to the best of the Company's
knowledge, there is no basis for any such claim (whether or not pending or
threatened). To the best of the Company's knowledge, all technical information
developed by and belonging to the Company which has not been patented has been
kept confidential. The Company has not granted or assigned to any other person
or entity any right to manufacture, have manufactured, assemble or sell the
products or proposed products or to provide the services or proposed services of
the Company.

      3.10 Title to Properties. The Company and its subsidiaries have good,
clear and marketable title to their respective properties and assets reflected
on the Balance Sheet or acquired by them since the date of the Balance Sheet
(other than properties and assets disposed of in the ordinary course of business
since the date of the Balance Sheet), and all such properties and assets are
free and clear of mortgages, pledges, security interests, liens, charges,
claims, restrictions and other encumbrances (including, without limitation,
easements and licenses), except for liens for or current taxes not yet due and
payable and minor imperfections of title, if any, not material in nature or
amount and not materially detracting from the value or impairing the use of the
property subject thereto or impairing the operations or proposed operations of
the Company and its subsidiaries, including, without limitation, the ability of
the Company and its subsidiaries to secure financing using such properties and
assets as collateral. To the best of the Company's knowledge after due inquiry,

there are no condemnation, environmental, zoning or other land use regulation
proceedings, either instituted or planned to be instituted, which would
adversely affect the use or operation of the Company's and its subsidiaries'
properties and assets for their respective intended uses and purposes, or the
value of such properties, and neither the Company nor any subsidiary has
received notice of any special assessment proceedings which would affect such
properties and assets.

      3.11 Leasehold Interests. Each lease or agreement to which the Company is
a party under which it is a lessee of any property, real or personal, is a valid
and subsisting agreement, duly authorized and entered into, without any default
of the Company thereunder and, to the best of the Company's knowledge, without
any default thereunder of any other party thereto. No event has occurred and is
continuing which, with due notice or lapse of time or both, would constitute a
default or event of default by the Company under any such


                                  Page 38 of 70
<PAGE>

lease or agreement or, to the best of the Company's knowledge, by any other
party thereto. The Company's possession of such property has not been disturbed
and, to the best of the Company's knowledge after due inquiry, no claim has been
asserted against the Company adverse to its rights in such leasehold interests.

      3.12 Insurance. The Company holds valid policies covering all of the
insurance required to be maintained by it under Section 4.04.

      3.13 Taxes. The Company has filed all tax returns, federal, state, county
and local, required to be filed by it, and the Company has paid all taxes shown
to be due by such returns as well as all other taxes, assessments and
governmental charges which have become due or payable (and are not the subject
of a valid extension of time), including, without limitation, all taxes which
the Company is obligated to withhold from amounts owing to employees, creditors
and third parties. The Company has established adequate reserves for all taxes
accrued but not yet payable. The Company has not received notice that its
federal income tax returns have been audited by the Internal Revenue Service. No
deficiency assessment with respect to or proposed adjustment of the Company's
federal, state, county or local taxes is pending or, to the best of the
Company's knowledge, threatened. There is no tax lien (other than for current
taxes not yet due and payable), whether imposed by any federal, state, county or
local taxing authority, outstanding against the assets, properties or business
of the Company.

      3.14 Other Agreements. Except as set forth in the attached Schedule V(A),
the Company is not a party to or otherwise bound by any written or oral
agreement, instrument, commitment or restriction which individually or in the
aggregate has, or which the Company believes is likely to, materially adversely
affect the business, prospects, financial condition, operations, property or
affairs of the Company. Except as set forth in the attached Schedule V(B), the
Company is not a party to or otherwise bound by any written or oral:

            (a) sales agency or similar agreement which is not terminable on
      less than ninety (90) days' notice without cost or other liability to the

      Company (except for agreements which, in the aggregate, are not material
      to the business of the Company);

            (b) agreement which entitles any customer to a rebate or right of
      set-off, or which varies in any material respect from the Company's
      standard form agreements;

            (c) agreement with any labor union (and, to the knowledge of the
      Company, no organizational effort is being made with respect to any of its
      employees);

            (d) agreement with any supplier or customer containing any provision
      permitting any party other than the Company to renegotiate the price or
      other terms, or containing any payback or other similar provision;

            (e) agreement for the future purchase of fixed assets or for the
      future purchase of materials, supplies or equipment in excess of its
      normal operating requirements;

            (f) agreement for the employment of any officer, employee or other
      person (whether of a legally binding nature or in the nature of informal
      understandings) on a full-time or consulting basis which is not terminable
      on notice


                                  Page 39 of 70
<PAGE>

      without cost or other liability to the Company, except normal severance
      arrangements and accrued vacation pay,

            (g) bonus, pension, profit-sharing, retirement, hospitalization,
      insurance, stock purchase, stock option or other plan, agreement or
      understanding pursuant to which benefits are provided to any employee of
      the Company (other than group insurance plans which are not self-insured
      and are applicable to employees generally);

            (h) agreement relating to the borrowing of money or to the
      mortgaging or pledging of, or otherwise placing a lien or security
      interest on, any asset of the Company;

            (i) voting trust or agreement, stockholders' agreement, pledge
      agreement, buy-sell agreement or first refusal or preemptive rights
      agreement relating to any securities of the Company;

            (j) agreement or obligation (contingent or otherwise) to issue, sell
      or otherwise distribute or to repurchase or otherwise acquire or retire
      any share of its capital stock or any of its other equity securities;

            (k) assignment, license or other agreement with respect to any form
      of intangible property;

            (l) agreement under which it has granted any person any registration
      rights, other than the Registration Rights Agreement;


            (m) agreement under which it has limited or restricted its right to
      compete with any person in any respect;

            (n) other agreement or group of related agreements with the same
      party involving more than $10,000 or continuing over a period of more than
      six months from the date or dates thereof (including renewals or
      extensions optional with another party), which agreement or group of
      agreements is not terminable by the Company without penalty upon notice of
      thirty (30) days or less, but excluding any agreement or group of
      agreements with a customer of the Company for the Company's products or
      services if such agreement or group of agreements was entered into by the
      Company in the ordinary course of business; or

            (o) other agreement, instrument, commitment, plan or arrangement, a
      copy of which would be required to be filed with the Securities and
      Exchange Commission (the "Commission") as an exhibit to a registration
      statement on Form S-1 if the Company were registering securities under the
      Securities Act of 1933, as amended (the "Securities Act") which has not
      yet been filed with the Commission and a copy delivered to counsel for the
      Purchasers.

The Company, and to the best of the Company's knowledge after due inquiry, each
other party thereto have in all material respects performed all the obligations
required to be performed by them to date (or each non-performing party has
received a valid, enforceable and irrevocable written waiver with respect to its
non-performance), have received no notice of default and are not in default
(with due notice or lapse of time or both) under any agreement, instrument,
commitment, plan or arrangement to which the Company is a party or by which it
or its property may be bound. The Company has no present expectation or
intention of not fully performing all its obligations under each such agreement,
instrument,


                                  Page 40 of 70
<PAGE>

commitment, plan or arrangement, and the Company has no knowledge of any breach
or anticipated breach by the other party to any agreement, instrument,
commitment, plan or arrangement to which the Company is a party. The Company is
in full compliance with all of the terms and provisions of its Charter and
By-laws, as amended.

      3.15 Loans and Advances. The Company does not have any outstanding loans
or advances to any person and is not obligated to make any such loans or
advances, except, in each case, for advances to employees of the Company in
respect of reimbursable business expenses anticipated to be incurred by them in
connection with their performance of services for the Company.

      3.16 Assumptions, Guaranties, Etc. of Indebtedness of Other Persons. The
Company has not assumed, guaranteed, endorsed or otherwise become directly or
contingently liable on any indebtedness of any other person (including, without
limitation, liability by way of agreement, contingent or otherwise, to purchase,
to provide funds for payment, to supply funds to or otherwise invest in the

debtor, or otherwise to assure the creditor against loss), except for guaranties
by endorsement of negotiable instruments for deposit or collection in the
ordinary course of business.

      3.17 Significant Customers and Suppliers. No customer or supplier which
was significant to the Company during the period covered by the financial
statements referred to in Section 3.05 or which has been significant to the
Company thereafter, has terminated, materially reduced or threatened to
terminate or materially reduce its purchases from or provision of products or
services to the Company, as the case may be.

      3.18 Governmental Approvals. Subject to the accuracy of the
representations and warranties of the Purchasers set forth in Article V, no
registration or filing with, or consent or approval of or other action by, any
federal, state or other governmental agency or instrumentality is or will be
necessary for the valid execution, delivery and performance by the Company of
this Agreement, the Registration Rights Agreement or the Stockholders'
Agreement, the issuance, sale and delivery of the Purchased Shares or, upon
conversion thereof, the issuance and delivery of the Converted Shares, other
than (i) filings pursuant to state securities laws (all of which filings have
been made by the Company, other than those which are required to be made after
the Closing and which will be duly made on a timely basis) in connection with
the sale of the Purchased Shares and (ii) with respect to the Registration
Rights Agreement. The registration of the shares covered thereby with the
Commission and filings pursuant to state securities laws.

      3.19 Disclosure. Neither this Agreement, nor any Schedule or Exhibit to
this Agreement, nor the Proxy Statement, nor the income summaries by center and
summaries regarding patient visits and revenue by center through August 31,
1996, nor the consolidated balance sheet of the Company as of August 31, 1996
contains an untrue statement of a material fact or omits a material fact
necessary to make the statements contained herein or therein not misleading as
of the date hereof. None of the statements, documents, certificates or other
items prepared or supplied by the Company with respect to the transactions
contemplated hereby contains an untrue statement of a material fact or omits a
material fact necessary to make the statements contained therein not misleading.
There is no fact which the Company has not disclosed to the Purchasers and their
counsel in writing and of which the Company is aware which materially and
adversely affects or could materially and adversely affect the business,
prospects, financial condition, operations, property or affairs of the Company
or any of its subsidiaries. The financial projections and other estimates
provided to the Purchasers were prepared by the Company based on the Company's
experience in the industry and on assumptions of fact and opinion as to future
events which the Company


                                  Page 41 of 70
<PAGE>

believes to be reasonable, but which the Company cannot and does not assure or
guarantee the attainment of in any manner. As of the date hereof, no facts have
come to the attention of the Company which would, in its opinion, require the
Company to revise or amplify the assumptions underlying such projections and
other estimates or the conclusions derived therefrom.


      3.20 Offering of the Purchased Shares. Neither the Company nor any person
authorized or employed by the Company as agent, broker, dealer or otherwise in
connection with the offering or sale of the Purchased Shares or any security of
the Company similar to the Purchased Shares has offered the Purchased Shares or
any such similar security for sale to, or solicited any offer to buy the
Purchased Shares or any such similar security from, or otherwise approached or
negotiated with respect thereto with, any person or persons, and neither the
Company nor any person acting on its behalf has taken or will take any other
action (including, without limitation, any offer, issuance or sale of any
security of the Company under circumstances which might require the integration
of such security with Purchased Shares under the Securities Act or the rules and
regulations of the Commission thereunder), in either case so as to subject the
offering, issuance or sale of the Purchased Shares to the registration
provisions of the Securities Act.

      3.21 Brokers. The Company has no contract, arrangement or understanding
with any broker, finder or similar agent with respect to the transactions
contemplated by this Agreement.

      3.22 Officers. Set forth in Schedule II is a list of the names of the
officers of the Company, together with the title or job classification of each
such person and the total compensation anticipated to be paid to each such
person by the Company and its subsidiaries in 1996. None of such persons has an
employment agreement or understanding, whether oral or written, with the Company
or any of its subsidiaries, which is not terminable on notice by the Company or
such subsidiary without cost or other liability to the Company or such
subsidiary.

      3.23 Transactions With Affiliates. No director, officer, employee or
stockholder of the Company, or member of the family of any such person, or any
corporation, partnership, trust or other entity in which any such person, or any
member of the family of any such person, has a substantial interest or is an
officer, director, trustee, partner or holder of more than 5% of the outstanding
capital stock thereof, is a party to any transaction with the Company, including
any contract, agreement or other arrangement providing for the employment of,
furnishing of services by, rental of real or personal property from or otherwise
requiring payments to any such person or firm, other than employment-at-will
arrangements in the ordinary course of business.

      3.24 Employees. Each of the officers of the Company, each key employee and
each other employee now employed by the Company who has access to confidential
information of the Company has executed a Confidentiality Agreement
(collectively, the "Confidentiality Agreements"), and such agreements are in
full force and effect. No officer or key employee of the Company has advised the
Company (orally or in writing) that he or she intends to terminate employment
with the Company. The Company has complied in all material respects with all
applicable laws relating to the employment of labor, including provisions
relating to wages, hours, equal opportunity, collective bargaining and the
payment of Social Security and other taxes, and with the Employee Retirement
Income Security Act of 1974, as amended ("ERISA").


                                  Page 42 of 70

<PAGE>

      3.25 U.S. Real Property Holding Corporation. The Company is not now and
has never been a "United States real property holding corporation," as defined
in Section 897(c)(2) of the Code and Section 1.897-2(b) of the Treasury
Regulations and the Company has filed with the Internal Revenue Service all
statements, if any, with its United States income tax returns which are required
under Section 1.897-2(h) of such Regulations.

      3.26 Environmental Protection. The Company has not caused or allowed, or
contracted with any party for, the generation, use, transportation, treatment,
storage or disposal of any Hazardous Substances (as defined below) in connection
with the operation of its business or otherwise which could reasonably be
expected to result in a claim or liability of a material adverse nature. The
Company, the operation of its business, and any real property that the Company
owns, leases or otherwise occupies or uses (the "Premises") are in compliance in
all material respects with all applicable Environmental Laws (as defined below)
and orders or directives of any governmental authorities having jurisdiction
under such Environmental Laws, including, without limitation, any Environmental
Laws or orders or directives with respect to any cleanup or remediation of any
release or threat of release of Hazardous Substances. The Company has not
received any citation, directive, letter or other communication, written or
oral, or any notice of any proceeding, claim or lawsuit, from any person arising
out of the ownership or occupation of the Premises, or the conduct of its
operations, and the Company is not aware of any basis therefor. The Company has
obtained and is maintaining in full force and effect all material permits,
licenses and approvals required by all Environmental Laws applicable to the
Premises and the business operations conducted thereon, and is in material
compliance with all such permits, licenses and approvals. The Company has not
caused or allowed a release, or a threat of release, of any Hazardous Substance
unto, at or near the Premises, and, to the best of the Company's knowledge, the
Premises has never been subject to a release, or a threat of release, of any
Hazardous Substance. For the purposes of this Agreement, the term "Environmental
Laws" shall mean any Federal, state or local law or ordinance or regulation
pertaining to the protection of human health or the environment, including,
without limitation, the Comprehensive Environmental Response, Compensation and
Liability Act, 42 U.S.C. Sections 9601, et seq., the Emergency Planning and
Community Right-to-Know Act, 42 U.S.C. Sections 11001, et seq., and the Resource
Conservation and Recovery Act, 42 U.S.C. Sections 6901, et seq. For purposes of
this Agreement, the term "Hazardous Substances" shall include oil and petroleum
products, asbestos, polychlorinated biphenyls, urea formaldehyde and any other
materials classified as hazardous or toxic under any Environmental Laws.

      3.27 ERISA.

            (a) Schedule II lists each Employee Plan that covers any employee of
the Company, copies or descriptions of all of which have previously been made
available or furnished to the Purchasers. With respect to each Employee Plan,
the Company has provided the most recently filed Form 5500 and an accurate
summary description of such plan.

            (b) Schedule II also includes a list of each Benefit Arrangement of
the Company, copies or descriptions of all of which have been made available or
furnished previously to the Purchasers.


            (c) No Employee Plan is a Multiemployer Plan and no Employee Plan is
subject to Title IV of ERISA. The Company and its Affiliates have not incurred
any liability under Title IV of ERISA arising in connection with the termination
of any plan covered or previously covered by Title IV of ERISA.


                                  Page 43 of 70
<PAGE>

            (d) None of the Employee Plans or other arrangements listed on
Schedule II covers any non-United States employee or former non-United States
employee of the Company.

            (e) No "prohibited transaction," as defined in Section 406 of ERISA
or Section 4975 of the Code, has occurred with respect to any Employee Plan.

            (f) Each Employee Plan which is intended to be qualified under
Section 401(a) of the Code is so qualified and has been so qualified during the
period from its adoption to date, and each trust forming a part thereof is
exempt from tax pursuant to Section 501 (a) of the Code. The Company has
furnished to the Purchasers copies of the most recent Internal Revenue Service
determination letters with respect to each such plan, including a letter with
respect to amendments required by the Tax Reform Act of 1986. Each Employee Plan
has been maintained in compliance with its terms and with the requirements
prescribed by any and all statutes, orders, rules and regulations, including,
but not limited to, ERISA and the Code, which are applicable to such plan.

            (g) Each Employee Plan and each Benefit Arrangement has been
maintained in substantial compliance with its terms and with the requirements
prescribed by any and all statutes, orders, rules and regulations which are
applicable to such Employee Plan and Benefit Arrangement.

            (h) Except as disclosed in writing to the Purchasers prior to the
date hereof, there has been no amendment to, written interpretation of or
announcement (whether or not written) by the Company or any of its ERISA
Affiliates relating to, or change in employee participation or coverage under,
any Employee Plan or Benefit Arrangement that would increase materially the
expense of maintaining such Employee Plan or Benefit Arrangement above the level
of the expense incurred in respect thereof for the fiscal year ended prior to
the date hereof.

            (i) There is no contract, agreement, plan or arrangement covering
any employee or former employee of the Company that, individually or
collectively, could give rise to the payment of any amount that would not be
deductible pursuant to the terms of Section 280G of the Code.

            (j) No tax under Section 4980B of the Code has been incurred in
respect of any Employee Plan that is a group health plan, as defined in Section
5000(b)(1) of the Code.

            (k) With respect to the employees and former employees of the
Company, there are no employee post-retirement medical or health plans in
effect, except as required by Section 4980B of the Code.


            (l) No employee of the Company will become entitled to any bonus,
retirement, severance or similar benefit or enhanced benefit solely as a result
of the transactions contemplated hereby.

            (m) The Company does not have, nor is it reasonably expected to
have, any liability under Title IV of ERISA.

      3.28 Foreign Corrupt Practices Act. The Company has not taken any action
which would cause it to be in violation of the Foreign Corrupt Practices Act of
1977, as amended, or any rules and regulations thereunder. To the best of the
Company's knowledge


                                  Page 44 of 70
<PAGE>

after due inquiry, there is not now, and there has never been, any employment by
the Company of, or beneficial ownership in the Company by, any governmental or
political official in any country in the world.

      3.29 Federal Reserve Regulations. The Company is not engaged in the
business of extending credit for the purpose of purchasing or carrying margin
securities (within the meaning of Regulation G of the Board of Governors of the
Federal Reserve System), and no part of the proceeds of the Preferred Shares
will be used to purchase or carry any margin security or to extend credit to
others for the purpose of purchasing or carrying any margin security or in any
other manner which would involve a violation of any of the regulations of the
Board of Governors of the Federal Reserve System.

      3.30 Additional Information. The Company has filed in a timely manner all
documents that the Company was required to file under the Securities Exchange
Act of 1934, as amended (the "Exchange Act") during the 12 months preceding the
date of this Agreement. The following documents complied in all material
respects with the requirements of the Exchange Act as of their respective filing
dates, and the information contained therein was true and correct in all
material respects as of the date of such documents, and each of the following
documents as of the date thereof did not contain an untrue statement of a
material fact or omit to state a material fact required to be stated therein or
necessary to make the statements therein, in light of the circumstances under
which they were made, not misleading:

            (a) The Company's Quarterly Report on Form 10-Q for the quarter year
      ended June 30, 1996; and

            (b) all other documents, if any, filed by the Company with the
      Securities and Exchange Commission (the "Commission") since the filing of
      the Quarterly Report on Form 10-Q for the fiscal quarter ended June 30,
      1996 pursuant to the reporting requirements of the Exchange Act.

      3.31 Securities Act of 1933. The Company has complied and will comply with
all applicable federal and state securities laws in connection with the offer,
issuance and sale of the Shares. Neither the Company nor anyone acting on its
behalf has or will sell, offer to sell or solicit offers to buy the Shares or

similar securities to, or solicit offers with respect thereto from, or enter
into any preliminary conversations or negotiations relating thereto with, any
Person, so as to bring the issuance and sale of the Shares under the
registration provisions of the Securities Act and applicable state securities
laws.

                                   ARTICLE IV

                            COVENANTS OF THE COMPANY

            The Company, together with its subsidiaries, covenants and agrees
with each of the Purchasers that:

      4.01 Financial Statements, Reports, Etc. The Company shall furnish to each
Purchaser:

            (a) within the time periods required for the furnishing thereof,
      copies of the Company's reports filed on Form 10-K, Form 10-Q and any
      successor form or forms;


                                  Page 45 of 70
<PAGE>

            (b) within thirty (30) days after the end of each month in each
      fiscal year (other than the last month in each fiscal year) a consolidated
      balance sheet of the Company and its subsidiaries, if any, the related
      consolidated statements of income, stockholders' equity and cash flows,
      income summaries by center, receivable aging tables by center and monthly
      center operating data unaudited but prepared in accordance with generally
      accepted accounting principles (except for notes and year-end adjustments)
      and certified by the Chief Financial Officer of the Company, such
      consolidated balance sheet to be as of the end of such month and such
      consolidated statements of income, stockholders' equity and cash flows to
      be for such month and for the period from the beginning of the fiscal year
      to the end of such month, in each case with comparative statements for the
      prior fiscal year, provided that the Company's obligations under this
      Section 4.01(b) shall terminate upon the completion of a firm commitment
      underwritten public offering of the Company's securities;

            (c) at the time of delivery of each annual financial statement
      pursuant to Section 4.01(a), a certificate executed by the Chief Financial
      Officer of the Company stating that such officer has caused this Agreement
      and the Series A Convertible Preferred Stock to be reviewed and has no
      knowledge of any default by the Company in the performance or observance
      of any of the provisions of this Agreement or the Series A Convertible
      Preferred Stock or, if such officer has such knowledge, specifying such
      default and the nature thereof;

            (d) at the time of delivery of each monthly statement pursuant to
      Section 4.01(b), a management narrative report explaining all significant
      variances from forecasts and all significant current developments in
      staffing, marketing, sales and operations;


            (e) no later than thirty (30) days prior to the start of each fiscal
      year, consolidated capital and operating expense budgets, cash flow
      projections and income and loss projections for the Company and its
      subsidiaries in respect of such fiscal year, all itemized in reasonable
      detail, by center (other than cash flow projections and prepared on a
      monthly basis, and, promptly after preparation, any revisions to any of
      the foregoing;

            (f) promptly following receipt by the Company, each audit response
      letter, accountant's management letter and other written report submitted
      to the Company by its independent public accountants in connection with an
      annual or interim audit of the books of the Company or any of its
      subsidiaries;

            (g) promptly after the commencement thereof, notice of all actions,
      suits, claims, proceedings, investigations and inquiries of the type
      described in Section 3.07 that could materially adversely affect the
      Company or any of its subsidiaries;

            (h) promptly upon sending, making available or filing the same, all
      press releases, reports and financial statements that the Company sends or
      makes available to its stockholders or directors or files with the
      Commission;

            (i) at the time of delivery to the Company's Board of Directors,
      reports, minutes, consents, waivers or such other information
      substantially similar to such reports, minutes, consents, waivers or other
      information delivered to the members of the Company's Board of Directors
      provided that each Purchaser understands that it could be subject to
      fines, penalties and other liabilities under applicable securities laws


                                      Page 46 of 70
<PAGE>

      in the event of trading in the Company's securities while in the
      possession of any material, non-public information concerning the Company
      and agrees to abide by these legal prohibitions on tipping and trading;
      and

            (j) promptly, from time to time, such other information regarding
      the business, prospects, financial condition, operations, property or
      affairs of the Company and its subsidiaries as such Purchaser reasonably
      may request.

      4.02 Reserve for Conversion Shares. The Company shall at all times reserve
and keep available out of its authorized but unissued shares of Common Stock,
for the purpose of effecting the conversion of the Purchased Shares and
otherwise complying with the terms of this Agreement, such number of its duly
authorized shares of Common Stock as shall be sufficient to effect the
conversion of the Purchased Shares from time to time outstanding or otherwise to
comply with the terms of this Agreement. If at any time the number of authorized
but unissued shares of Common Stock shall not be sufficient to effect the
conversion of the Purchased Shares or otherwise to comply with the terms of this

Agreement, the Company will forthwith take such corporate action as may be
necessary to increase its authorized but unissued shares of Common Stock to such
number of shares as shall be sufficient for such purposes. The Company will
obtain any authorization, consent, approval or other action by or make any
filing with any court or administrative body that may be required under
applicable state securities laws in connection with the issuance of shares of
Common Stock upon conversion of the Purchased Shares.

      4.03 Existence. The Company shall maintain and cause each of its
subsidiaries (if any) to maintain, their respective corporate or legal
existence, rights and franchises in full force and effect.

      4.04 Properties, Business, Insurance. The Company shall maintain and cause
each of its subsidiaries (if any) to maintain as to their respective properties
and business, with financially sound and reputable insurers, insurance against
such casualties and contingencies and of such types and in such amounts as is
customary for companies similarly situated, which insurance shall be deemed by
the Company to be sufficient. The Company shall also use its best efforts to
obtain within 45 days of the Initial Closing Date and thereafter maintain in
effect a "key person" life insurance policy, payable to the Company, on the life
of John Garbarino (so long as he remains an employee of the Company), in the
amount of $1,000,000. The Company shall not cause or permit any assignment or
change in beneficiary and shall not borrow against any such policy. If requested
by Purchasers holding at least a majority of the outstanding Purchased Shares,
the Company will add one designee of such Purchasers as a notice party for each
such policy and shall request that the issuer of each policy provide such
designee with ten (10) days' notice before such policy is terminated (for
failure to pay premiums or otherwise) or assigned or before any change is made
in the beneficiary thereof.

      4.05 Inspection, Consultation and Advice. The Company shall permit and
cause each of its subsidiaries (if any) to permit each Purchaser and such
persons as it may designate, at such Purchaser's expense, to visit and inspect
any of the properties of the Company and its subsidiaries, examine their books
and take copies and extracts therefrom, discuss the affairs, finances and
accounts of the Company and its subsidiaries with their officers, employees and
public accountants (and the Company hereby authorizes said accountants to
discuss with such Purchaser and such designees such affairs, finances and
accounts), and consult with and advise the management of the Company and its
subsidiaries as to their affairs, finances and accounts, all at reasonable times
and upon reasonable notice.


                                  Page 47 of 70
<PAGE>

      4.06 Restrictive Agreements Prohibited. Neither the Company nor any of its
subsidiaries shall become a party to any agreement which by its terms restricts
the Company's performance of this Agreement, the Registration Rights Agreement,
the Stockholders' Agreement or the Charter.

      4.07 Transactions with Affiliates. Except for transactions contemplated by
this Agreement or as otherwise approved by the Board of Directors, neither the
Company nor any of its subsidiaries shall enter into any transaction with any

director, officer, employee or holder of more than 5% of the outstanding capital
stock of any class or series of capital stock of the Company or any of its
subsidiaries, member of the family of any such person, or any corporation,
partnership, trust or other entity in which any such person, or member of the
family of any such person, is a director, officer, trustee, partner or holder of
more than 5% of the outstanding capital stock thereof, except for transactions
on customary terms related to such person's employment.

      4.08 Expenses of Directors. The Company shall promptly reimburse in full,
each director of the Company who is not an employee of the Company and who was
elected as a director solely or in part by the holders of Series A Convertible
Preferred Stock, for all of his or her reasonable out-of-pocket expenses
incurred in attending each meeting of the Board of Directors of the Company or
any Committee thereof.

      4.09 Board of Directors Meetings. The Company shall use its best efforts
to ensure that meetings of its Board of Directors are held at least four times
each year and at least once each quarter.

      4.10 Compensation. The Company shall not pay to its management
compensation in excess of that compensation customarily paid to management in
companies of similar size, of similar maturity, and in similar businesses
without the unanimous written consent of those members of the Company's Board of
Directors elected solely by the holders of Series A Convertible Preferred Stock.

      4.11 By-laws. The Company shall use its best efforts, as promptly as
reasonably practicable after the Initial Closing Date, to cause its By-laws to
provide that, unless otherwise required by the laws of the State of Delaware,
any two directors shall have the right to call a meeting of the Board of
Directors. The Company shall at all times maintain provisions in its By-laws
and/or Charter indemnifying all directors against liability and absolving all
directors from liability to the Company and its stockholders to the maximum
extent permitted under the laws of the State of Delaware.

      4.12 Reserved Employee Shares. From and after the Closing Dates
contemplated by this Agreement, the Company shall cause to be reserved for
issuance to directors, officers, employees and consultants of the Company on the
date hereof at least the same percentage of the fully diluted capital stock of
the Company as existed immediately prior to the Initial Closing Date, and the
Company shall also cause to be reserved for issuance to directors, officers,
employees and consultants of the Company commencing such relationship with the
Company after the date hereof an additional 5% of the fully diluted capital
stock of the Company (collectively, the "Reserved Employee Shares"), such
Reserved Employee Shares to be issued at a price equal to or greater than the
Series A Conversion Price (as defined in paragraph 6 of the Company's
Certificate of Designations filed with the Secretary of State of the State of
Delaware on the date hereof), pursuant to stock purchase, stock grant or stock
option arrangements pursuant to which such Reserved Employee Shares will not
become fully exercisable less than three years nor more than five years from the
date of such


                                  Page 48 of 70
<PAGE>


grant without the unanimous written consent of those members of the Company's
Board of Directors elected solely by the holders of Series A Convertible
Preferred Stock.

      4.13 Employee Confidentiality Agreements. The Company shall use its best
efforts to obtain, and shall cause its subsidiaries (if any) to use their best
efforts to obtain, Confidentiality Agreement from all future officers, key
employees and other employees who will have access to confidential information
of the Company or any of its subsidiaries, upon their employment by the Company
or any of its subsidiaries.

      4.14 Compliance with Laws. The Company shall comply, and cause each
subsidiary to comply, with all applicable laws, rules, regulations and orders,
noncompliance with which could materially adversely affect its business or
condition, financial or otherwise.

      4.15 Keeping of Records and Books of Account. The Company shall keep, and
cause each subsidiary to keep, adequate records and books of account, in which
complete entries will be made in accordance with generally accepted accounting
principles consistently applied, reflecting all financial transactions of the
Company and such subsidiary, and in which, for each fiscal year, all proper
reserves for depreciation, depletion, obsolescence, amortization, taxes, bad
debts and other purposes in connection with its business shall be made.

      4.16 U.S. Real Property Interest Statement. The Company shall provide
prompt written notice to each Purchaser following any "determination date" (as
defined in Treasury Regulation Section 1.897-2(c)(i)) on which the Company
becomes a United States real property holding corporation. In addition, upon a
written request by any Purchaser, the Company shall provide such Purchaser with
a written statement informing the Purchaser whether such Purchaser's interest in
the Company constitutes a U.S. real property interest. The Company's
determination shall comply with the requirements of Treasury Regulation Section
1.897-2(h)(1) or any successor regulation, and the Company shall provide timely
notice to the Internal Revenue Service, in accordance with and to the extent
required by Treasury Regulation Section 1.8972(h)(2) or any successor
regulation, that such statement has been made. The Company's written statement
to any Purchaser shall be delivered to such Purchaser as soon as practicable but
in any event within thirty (30) days of such Purchaser's written request
therefor. The Company's obligation to furnish a written statement pursuant to
this Section 4.16 shall continue notwithstanding the fact that a class of the
Company's stock may be regularly traded on an established securities market.

      4.17 Compensation and Audit Committees. The Company shall, by amending its
By-laws or otherwise, establish and maintain a Compensation Committee and an
Audit Committee of the Board of Directors, each of which shall consist of at
least three directors. The three directors serving on the Compensation Committee
of the Company shall initially be Edward L. Cahill, Angus M. Duthie and one
other director of the Company unaffiliated with management of the Company who
shall be appointed after the Initial Closing Date. Except for arrangements
existing on the date hereof, no compensation or other remuneration at an annual
rate in excess of $100,000 shall be paid to, and no capital stock of the Company
shall be issued or granted to, any director, officer or employee of, or any
consultant or adviser to, the Company or any of its subsidiaries, without the

approval of the Compensation Committee. No employee stock option plan, employee
stock purchase plan, employee restricted stock plan or other employee stock plan
shall be established without the approval of the Compensation Committee. The
Audit Committee shall select (subject to the approval of the Board of Directors)
and provide instructions to the Company's auditors.


                                  Page 49 of 70
<PAGE>

      4.18 Listing. The Company shall use its best efforts to comply with all
requirements of the National Association of Securities Dealers, Inc. (the
"NASD") and the Nasdaq SmallCap Market with respect to the issuance of the
Shares and the listing of the Company's Common Stock on the Nasdaq SmallCap
Market.

      4.19 Termination of Covenants. The covenants set forth herein shall
terminate and be of no further force or effect as to each of the Purchasers when
such Purchaser no longer holds any shares of Series A Convertible Preferred
Stock.

                                    ARTICLE V

                    REPRESENTATIONS, WARRANTIES AND COVENANTS
                                OF THE PURCHASERS

            (a) Each of the Purchasers, severally and not jointly, represents
and warrants to, and covenants with, the Company, as of the date hereof, the
Initial Closing Date and as of the Additional Closing Date, that: (i) it will
acquire the Purchased Shares to be acquired by it for its own account and that
the Purchased Shares are being and will be acquired by it for the purpose of
investment and not with a view to distribution or resale thereof; (ii) the
execution of this Agreement and the consummation of the transactions
contemplated hereby have been duly authorized by all necessary action on the
part of the Purchaser, and this Agreement has been duly executed and delivered,
and constitutes a valid, legal, binding and enforceable agreement of the
Purchaser; (iii) it is an "accredited investor" within the meaning of Rule 501
of Regulation D promulgated under the Securities Act and was not organized for
the specific purpose of acquiring the Purchased Shares; (iv) it has taken no
action which would give rise to any claim by any other person for any brokerage
commissions, finders' fees or the like relating to this Agreement or the
transactions contemplated hereby, (v) it has sufficient knowledge and experience
in investing in companies similar to the Company in terms of the Company's stage
of development so as to be able to evaluate the risks and merits of its
investment in the Company and it is able financially to bear the risks thereof;
(vi) without limiting the representations or warranties of the Company in
Article III hereof, it has had an opportunity to discuss the Company's business,
management and financial affairs with the Company's management, and it has been
furnished with copies of documents which it has requested; and (vii) it is not
an "Interested Stockholder" of the Company as that term is defined in the
Company's Charter and Section 203 of the Delaware General Corporation law.

            (b) Each of the Purchasers, severally and not jointly, further
represents and warrants to, and covenants with, the Company that (i) the

Purchaser has full right, power, authority and capacity to enter into this
Agreement and to consummate the transactions contemplated hereby and has taken
all necessary action to authorize the execution, delivery and performance of
this Agreement, and (ii) upon the execution and delivery of this Agreement, this
Agreement shall constitute a valid and binding obligation of the Purchaser
enforceable in accordance with its terms, except as enforceability may be
limited by applicable bankruptcy, insolvency, reorganization, moratorium or
similar laws affecting creditors' and contracting parties' rights generally and
except as enforceability may be subject to general principles of equity
(regardless of whether such enforceability is considered in a proceeding in
equity or at law) and except as the indemnification agreements of the Purchaser
herein may be legally unenforceable.

            (c) Each of the Purchasers further represents that it understands
and agrees that, until registered under the Securities Act or transferred
pursuant to the provisions


                                  Page 50 of 70
<PAGE>

of Rule 144 as promulgated by the Commission, all certificates evidencing any of
the Shares, whether upon initial issuance or upon any transfer thereof, shall
bear a legend, prominently stamped or printed thereon, reading substantially as
follows, together with any legends that may be required under applicable state
securities laws:

      "The securities represented by this certificate have not been registered
under the Securities Act of 1933 or applicable state securities laws. These
securities have been acquired for investment and not with a view to distribution
or resale, and may not be sold, mortgaged, pledged, hypothecated or otherwise
transferred [for non U.S. persons add: in the United States or to U.S. persons]
without an effective registration statement for such securities under the
Securities Act of 1933 and applicable state securities laws, or the availability
of an exemption from the registration provisions of the Securities Act of 1933
and applicable state securities laws."

                                   ARTICLE VI

                             RIGHT OF FIRST REFUSAL

      6.01 Right of First Refusal. The Company shall not issue, sell or
exchange, agree or obligate itself to issue, sell or exchange, or reserve or set
aside for issuance, sale or exchange, for a price equal to or less than the then
applicable "Series A Conversion Price" (as defined in paragraph 6 of the
Company's Certificate of Designations filed with the Secretary of State of the
State of Delaware on the date hereof) any (i) shares of Common Stock, (ii) any
other equity security of the Company, including, without limitation, shares of
Series A Preferred Stock, (iii) any debt security which by its terms is
convertible into or exchangeable for any equity security of the Company, (iv)
any security of the Company that is a combination of debt and equity, or (v) any
option, warrant or other right to subscribe for, purchase or otherwise acquire
any such equity security or any such debt security of the Company, unless in
each case the Company shall have first offered to sell such securities (the

"Offered Securities") to the Purchasers as follows: The Company shall offer to
sell to each Purchaser (a) that portion of the Offered Securities as the number
of shares of Purchased Shares and Converted Shares then held by such Purchaser,
as the case may be, bears to the total number of shares of Common Stock,
Purchased Shares and Converted Shares outstanding on such date (the "Basic
Amount"), and (b) such additional portion of the Offered Securities as such
Purchaser shall indicate it will purchase should the other Purchasers subscribe
for less than their Basic Amounts (the "Undersubscription Amount"), at a price
and on such other terms as shall have been specified by the Company in writing
delivered to such Purchaser (the "Offer"), which Offer by its terms shall remain
open and irrevocable for a period of twenty (20) days from receipt of the Offer.

      6.02 Notice of Acceptance. Notice of each Purchaser's intention to accept,
in whole or in part, any Offer made pursuant to Section 6.01 shall be evidenced
by a writing signed by such Purchaser and delivered to the Company prior to the
end of the 20-day period of such Offer, setting forth such of the Purchaser's
Basic Amount as such Purchaser elects to purchase and, if such Purchaser shall
elect to purchase all of its Basic Amount, such Undersubscription Amount as such
Purchaser shall elect to purchase (the "Notice of Acceptance"). If the Basic
Amounts subscribed for by all Purchasers are less than the total Offered
Securities, then each Purchaser who has set forth Undersubscription Amounts in
its Notice of Acceptance shall be entitled to purchase, in addition to the Basic
Amounts subscribed for, all Undersubscription Amounts it has subscribed for;
provided, however, that should the Undersubscription Amounts subscribed for
exceed the difference between the Offered Securities and the Basic Amounts
subscribed for (the "Available Undersubscription


                                  Page 51 of 70
<PAGE>

Amount"), each Purchaser who has subscribed for any Undersubscription Amount
shall be entitled to purchase only that portion of the Available
Undersubscription Amount as the Undersubscription Amount subscribed for by such
Purchaser bears to the total Undersubscription Amounts subscribed for by all
Purchasers, subject to rounding by the Board of Directors to the extent it
reasonably deems necessary.

      6.03 Conditions to Acceptances and Purchase.

            (a) Permitted Sales of Refused Securities. In the event that Notices
of Acceptance are not given by the Purchasers in respect of all the Offered
Securities, the Company shall have seventy-five (75) days from the expiration of
the period set forth in Section 6.01 to close the sale of all or any part of
such Offered Securities as to which a Notice of Acceptance has not been given by
the Purchasers (the "Refused Securities") to the Person or Persons specified in
the Offer, but only for cash and/or debt securities and otherwise in all
respects upon terms and conditions, including, without limitation, unit price
and interest rates, which are no more favorable, in the aggregate, to such other
Person or Persons or less favorable to the Company than those set forth in the
Offer.

            (b) Reduction in Amount of Offered Securities. In the event the
Company shall propose to sell less than all the Refused Securities (any such

sale to be in the manner and on the terms specified in Section 6.03(a) above),
then each Purchaser may, at its sole option and in its sole discretion, reduce
the number, or other units, of the Offered Securities specified in its
respective Notices of Acceptance to an amount which shall be not less than the
amount of the Offered Securities which the Purchaser elected to purchase
pursuant to Section 6.02 multiplied by a fraction, (i) the numerator of which
shall be the amount of Offered Securities which the Company actually proposes to
sell, and (ii) the denominator of which shall be the amount of all Offered
Securities. In the event that any Purchaser so elects to reduce the number or
amount of Offered Securities specified in its respective Notices of Acceptance,
the Company may not sell or otherwise dispose of more than the reduced amount of
the Offered Securities until such securities have again been offered to the
Purchasers in accordance with Section 6.01.

            (c) Closing. Upon the closing, which shall include full payment to
the Company, of the sale to such other Person or Persons of all or less than all
the Refused Securities, the Purchasers shall purchase from the Company, and the
Company shall sell to the Purchasers, the number of Offered Securities specified
in the Notices of Acceptance, as reduced pursuant to Section 6.03(b) if the
Purchasers have so elected, upon the terms and conditions specified in the
Offer. The purchase by the Purchasers of any Offered Securities is subject in
all cases to the preparation, execution and delivery by the Company and the
Purchasers of a purchase agreement relating to such Offered Securities
reasonably satisfactory in form and substance to the Purchasers and their
respective counsel.

      6.04 Further Sale. In each case, any Offered Securities not purchased by
the Purchasers or other Person or Persons in accordance with Section 6.03 may
not be sold or otherwise disposed of until they are again offered to the
Purchasers under the procedures specified in Sections 6.01, 6.02 and 6.03.

      6.05 Exception. The rights of the Purchasers under this Article VI shall
not apply to:

            (a) Common Stock issued as a stock dividend to holders of Common
      Stock or upon any subdivision or combination of shares of Common Stock,


                                  Page 52 of 70
<PAGE>

            (b) Series A Preferred Stock issued as a dividend to holders of
      Series A Preferred Stock upon any subdivision or combination of shares of
      Series A Preferred Stock,

            (c) the Converted Shares,

            (d) the Additional Preferred Shares,

            (e) any Reserved Employee Shares,

            (f) Common Stock issued pursuant to the exercise or conversion of
      options, warrants and convertible securities outstanding on the Initial
      Closing Date,


            (g) Common Stock issued pursuant to the acquisition of another
      entity by the Company by merger (whereby the Company or its shareholders
      immediately prior to such merger own no less than 51% of the voting power
      of the acquired entity or the surviving corporation after such merger) or
      purchase of substantially all of its stock or assets (including the Common
      Stock to be issued to Argosy Health, L.P.), and

            (h) any securities issued pursuant to a firm commitment underwritten
      public offering.

                                   ARTICLE VII

                        DEFINITIONS AND ACCOUNTING TERMS

      7.01 Certain Defined Terms. As used in this Agreement, the following terms
shall have the following meanings (such meanings to be equally applicable to
both the singular and plural forms of the terms defined):

            "Additional Preferred Shares" shall have the meaning attributable to
      it in Section 1.02 of the Agreement.

            "Agreement" means this Series A Convertible Preferred Stock Purchase
      Agreement as from time to time amended and in effect between the parties,
      including all Exhibits and Schedules hereto.

            "Benefit Arrangement" means each employment, severance or other
      similar contract, arrangement or policy (written or oral) and each plan or
      arrangement (written or oral) providing for severance benefits, insurance
      coverage (including any self-insured arrangements), workers' compensation,
      disability benefits, supplemental unemployment benefits, vacation
      benefits, retirement benefits or for deferred compensation,
      profit-sharing, bonuses, stock options, stock appreciation rights or other
      forms of incentive compensation or post-retirement insurance, compensation
      or benefits which (i) is not an Employee Plan and (ii) covers any employee
      or former employee of the Company.

            "Board of Directors" means the board of directors of the Company as
      constituted from time to time.


                                  Page 53 of 70
<PAGE>

            "Common Stock" includes (a) the Company's Common Stock, $.001 par
      value, as authorized on the date of this Agreement, (b) any other capital
      stock of any class or classes (however designated) of the Company,
      authorized on or after the date hereof, the holders of which shall have
      the right, without limitation as to amount, either to all or to a share of
      the balance of current dividends and liquidating dividends after the
      payment of dividends and distributions on any shares entitled to
      preference, and the holders of which shall ordinarily, in the absence of
      contingencies or in the absence of any provision to the contrary in the
      Company's Charter be entitled to vote for the election of a majority of

      directors of the Company (even though the right so to vote has been
      suspended by the happening of such a contingency or provision), and (c)
      any other securities into which or for which any of the securities
      described in (a) or (b) may be converted or exchanged pursuant to a plan
      of recapitalization, reorganization, merger, sale of assets or otherwise.

            "Company" means and shall include Occupational Health +
      Rehabilitation Inc, a Delaware corporation and its predecessors,
      successors and assigns.

            "Consolidated" and "consolidating" when used with reference to any
      term defined herein mean that term as applied to the accounts of the
      Company and its Subsidiaries consolidated in accordance with generally
      accepted accounting principles.

            "Converted Shares" shall have that meaning attributable to it in
      Section 1.03 of this Agreement.

            "Employee Plan" means each "employee benefit plan," as such term is
      defined in Section 3(3) of ERISA, that (A)(i) is subject to any provision
      of ERISA and (ii) is maintained or contributed to by the Company, or
      (B)(i) is subject to any provision of Title IV of ERISA and (ii) is
      maintained or contributed to by any of the Company's ERISA Affiliates.

            "ERISA" means the Employee Retirement Income Security Act of 1974,
      as amended.

            "ERISA Affiliate" of any entity means any other entity that,
      together with such entity, would be treated as a single employer under
      Section 414 of the Code.

            "Initial Closing" and "Initial Closing Date" shall have the
      respective meanings attributable to them in Section 1.05 of this
      Agreement.

            "Initial Preferred Shares" shall have the meaning attributable to it
      in Section 1.01 of this Agreement.

            "Multiemployer Plan" means each Employee Plan that is a
      multiemployer plan, as defined in Section 3(37) of ERISA.

            "Person" means an individual, corporation, partnership, joint
      venture, trust, limited liability company or unincorporated organization,
      or a government or any agency or political subdivision thereof.

            "Purchased Shares" shall have that meaning attributable to it in
      Section 1.02 of this Agreement.


                                  Page 54 of 70
<PAGE>

            "Purchaser" and "Purchasers" shall have that meaning attributable to
      it in Section 1.01 of this Agreement and shall include the original

      Purchasers and also any other holder of any of the Shares.

            "Reserved Employee Shares" shall have the meaning attributable to it
      in Section 4.12 of this Agreement.

            "Securities Act" means the Securities Act of 1933, or any similar
      Federal statute, and the rules and regulations of the Securities and
      Exchange Commission (or of any other Federal agency then administering the
      Securities Act) thereunder, all as the same shall be in effect at the
      time.

            "Series A Preferred Stock" means the Series A Convertible Preferred
      Stock of the Company, $.001 par value, having the rights, powers,
      privileges and preferences set forth in Exhibit 1.01A hereto.

            "Shares" shall have that meaning attributable to it in Section 1.04
      of this Agreement.

            "Subsidiary" or "Subsidiaries" means any Person of which the Company
      and/or any of its other subsidiaries (as herein defined) directly or
      indirectly owns at the time at least fifty percent (50%) of the
      outstanding equity interest of such Person other than directors'
      qualifying shares.

      7.02 Accounting Terms. All accounting terms not specifically defined
herein shall be construed in accordance with generally accepted accounting
principles consistently applied, and all financial data submitted pursuant to
this Agreement shall be prepared in accordance with such principles.

                                  ARTICLE VIII

                                  MISCELLANEOUS

      8.01 No Waiver; Cumulative Remedies. No failure or delay on the part of
any party to this Agreement in exercising any right, power or remedy hereunder
shall operate as a waiver thereof; nor shall any single or partial exercise of
any such right, power or remedy preclude any other or further exercise thereof
or the exercise of any other right, power or remedy hereunder. The remedies
herein provided are cumulative and not exclusive of any remedies provided by
law.

      8.02 Amendments, Waivers and Consents. Any provision in this Agreement to
the contrary notwithstanding, and except as hereinafter provided, changes in or
additions to this Agreement may be made, and compliance with any covenant or
provision set forth herein may be omitted or waived, if the Company (i) shall
obtain consent thereto in writing from the holder or holders of at least a
majority in interest of the Shares, and (ii) shall deliver copies of such
consent in writing to any holders who did not execute such consent. Any waiver
or consent may be given subject to satisfaction of conditions stated therein and
any waiver or consent shall be effective only in the specific instance and for
the specific purpose for which given. Notwithstanding anything to the contrary
contained herein, any amendment which (x) increases any Purchaser's obligations
hereunder or increases the purchase price or number of Additional Preferred
Shares, or (y) grants to any one or more Purchasers any rights more



                                  Page 55 of 70
<PAGE>

favorable than any rights granted to all other Purchasers hereunder, must be
approved by each Purchaser so as to be effective against such Purchaser.

      8.03 Addresses for Notices. All notices, requests, demands and other
communications provided for hereunder shall be in writing (including electronic
communication) and delivered personally, or by overnight courier, or by
facsimile or other electronic means or sent by certified or registered United
States mail, postage prepaid, return receipt requested and addressed as follows:

      If to any holder of the Shares: at such holder's address for notice as set
forth in the register maintained by the Company, or, as to each of the
foregoing, at the addresses set forth on Schedule I hereto or at such other
address as shall be designated by such Person in a written notice to the other
parties complying as to delivery with the terms of this Section, with a copy to
Leslie E. Davis, Esq., Testa, Hurwitz & Thibeault, LLP, High Street Tower, 125
High Street, Boston, Massachusetts 02110.

      If to the Company: at the address set forth on page 1 hereof, or at such
other address as shall be designated by the Company in a written notice to the
other parties complying as to delivery with the terms of this Section, with a
copy to Donna L. Brooks, Esq., Shipman & Goodwin LLP, One American Row,
Hartford, CT 06103.

      All such notices, requests, demands and other communications shall be
effective three days after deposited in the mails or upon receipt when delivered
electronically, by facsimile, by hand or by overnight courier, respectively,
addressed as aforesaid, unless otherwise provided herein.

      8.04 Costs, Expenses and Taxes. The Company agrees to pay in connection
with the preparation, execution and delivery of this Agreement and the issuance
of the Purchased Shares, the reasonable fees and out-of-pocket expenses
collectively (not to exceed $25,000) of Testa, Hurwitz & Thibeault, LLP, special
counsel for the Purchasers, and other consultants. In addition, the Company
shall pay any and all stamp and other taxes payable or determined to be payable
in connection with the execution and delivery of this Agreement, the issuance of
the Purchased Shares and the other instruments and documents to be delivered
hereunder or thereunder, and agrees to save the Purchasers harmless from and
against any and all liabilities with respect to or resulting from any delay in
paying or omission to pay such taxes.

      8.05 Binding Effect; Assignment. This Agreement shall be binding upon and
inure to the benefit of the Company and the Purchasers and their respective
heirs, successors and assigns, except that the Company shall not have the right
to delegate any of its respective obligations hereunder or to assign its
respective rights hereunder or any interest herein without the prior written
consent of the holders of at least a majority in interest of the Shares.

      8.06 Survival of Representations and Warranties. All representations and
warranties made in this Agreement, the Shares, or any other instrument or

document delivered in connection herewith or therewith, shall survive the
execution and delivery hereof or thereof.

      8.07 Prior Agreements. This Agreement constitutes the entire agreement
between the parties and supersedes any prior understandings or agreements
concerning the purchase and sale of the Shares.


                                  Page 56 of 70
<PAGE>

      8.08 Severability. The provisions of this Agreement and the terms of the
Series A Preferred Stock are severable and, in the event that any court of
competent jurisdiction shall determine that any one or more of the provisions or
part of a provision contained in this Agreement or the Series A Preferred Stock
shall, for any reason, be held to be invalid, illegal or unenforceable in any
respect, such invalidity, illegality or unenforceability shall not affect any
other provision or part of a provision of this Agreement or the terms of the
Series A Preferred Stock; but this Agreement and the terms of the Series A
Preferred Stock shall be reformed and construed as if such invalid or illegal or
unenforceable provision, or part of a provision, had never been contained
herein, and such provisions or part reformed so that it would be valid, legal
and enforceable to the maximum extent possible.

      8.09 Governing Law. This Agreement shall be construed and enforced in
accordance with and governed by the General Corporation Law of the State of
Delaware as to matters within the scope thereof, and as to all other matters
shall be governed by and construed in accordance with the internal laws of the
Commonwealth of Massachusetts.

      8.10 Headings. Article, Section and subsection headings in this Agreement
are included herein for convenience of reference only and shall not constitute a
part of this Agreement for any other purpose.

      8.11 Counterparts. This Agreement may be executed in any number of
counterparts, all of which taken together shall constitute one and the same
instrument, and any of the parties hereto may execute this Agreement by signing
any such counterpart.

      8.12 Further Assurances. From and after the date of this Agreement, upon
the request of any Purchaser or the Company, the Company and the Purchasers
shall execute and deliver such instruments, documents and other writings as may
be reasonably necessary or desirable to confirm and carry out and to effectuate
fully the intent and purposes of this Agreement and all ancillary documents,
instruments or certificates delivered therewith and the Shares.

                [REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]


                                  Page 57 of 70
<PAGE>

      IN WITNESS WHEREOF, the parties hereto have caused this Series A Preferred
Stock Purchase Agreement to be executed as of the date first above written.


THE COMPANY:                        PURCHASERS:

OCCUPATIONAL HEALTH +               CAHILL, WARNOCK STRATEGIC
  REHABILITATION INC                   PARTNERS FUND, L.P.

                                    By: Cahill, Warnock Strategic Partners, L.P.


By:_____________________________    By:_________________________________________
  John C. Garbarino                    Title:  General Partner
  President and Chief Executive        
  Officer

                                    STRATEGIC ASSOCIATES, L.P.

                                    By: Cahill, Warnock & Company, LLC



                                    By:_________________________________________
                                       Title:  Managing Member


                                    AXA U. S. GROWTH FUND, LLC



                                    By:_________________________________________
                                       Title:  Managing Member


                                    U.S. GROWTH FUND PARTNERS, C.V.



                                    By:_________________________________________
                                       Title:  General Partner


                                    DOUBLE BLACK DIAMOND II, LLC



                                    By:_________________________________________
                                       Title:  General Partner


                                  Page 58 of 70
<PAGE>

                                    ALMANORI LIMITED




                                    By:_________________________________________
                                         Title:  Attorney-in-Fact


                                    THE VENTURE CAPITAL FUND OF
                                     NEW ENGLAND III, L.P.

                                    By: FH & Co. III, L.P., Its General Partner



                                    By:_________________________________________


                                    BANCBOSTON VENTURES, INC.


                                    By:_________________________________________


                                    VENROCK ASSOCIATES II, L.P.


                                    By:_________________________________________


                                    ASSET MANAGEMENT ASSOCIATES,
                                     1989, L.P.

                                    By: AMC Partners 89, L.P., General Partner


                                    By:_________________________________________


                                  Page 59 of 70
<PAGE>

                   OCCUPATIONAL HEALTH + REHABILITATION INC.

                                  SCHEDULE I

                                Initial                Additional
Name and                       Preferred    Purchase    Preferred    Purchase
Address of Purchasers           Shares        Price      Shares        Price
- ---------------------           ------        -----      ------        -----
                             
Cahill, Warnock Strategic       679,042    $4,074,252     119,750     $718,500
Partners Fund, L.P.
10 North Calvert Street
Suite 735
Baltimore, Maryland 21202
Attn: Mr. Edward L. Cahill


Strategic Associates, L.P.       37,625       225,750       6,750       40,500
10 North Calvert Street
Suite 735
Baltimore, Maryland 21202
Attn: Mr. Edward L. Cahill

Axa U.S. Growth Fund, LLC        86,667       520,002      15,250       91,500
c/o Partech International
50 California Street
Suite 3200
San Francisco, CA  94111
Attn:  Mr. Thomas G. McKinley

U.S. Growth Fund, C.V.          173,334     1,040,004      30,500      183,000
c/o Partech International
50 California Street
Suite 3200
San Francisco, CA  94111
Attn:  Mr. Thomas G. McKinley

Double Black Diamond, LLC        16,667       100,002       3,000       18,000
c/o Partech International
50 California Street
Suite 3200
San Francisco, CA  94111
Attn:  Mr. Thomas G. McKinley

Almanori Limited                  6,665        39,990       1,250        7,500
c/o Partech International
50 California Street
Suite 3200
San Francisco, CA  94111
Attn:  Mr. Thomas G. McKinley

Asset Management Associates,     83,333       499,998      14,500       87,000
1989, L.P.
2275 East Bayshore Road
Palo Alto, CA  94303
Attn:  Mr. Craig C. Taylor


                                    Page 60 of 70
<PAGE>

                                Initial                Additional
Name and                       Preferred    Purchase    Preferred    Purchase
Address of Purchasers           Shares        Price      Shares        Price
- ---------------------           ------        -----      ------        -----

Venrock Associates               66,667       400,002      11,800       70,800
755 Page Mill Road, 
Suite 8230
Palo Alto, CA  94303
Attn:  Mr. Patrick F. Latterell


Venrock Associates II, L.P.     100,000       600,000      17,700      106,200
755 Page Mill Road, Suite 8230
Palo Alto, CA  94303
Attn:  Mr. Patrick F. Latterell

The Venture Capital Fund of      66,667       400,002      11,750       70,500
New England, III, L.P.
160 Federal Street, 
23rd Floor
Boston, MA  02110
Attn:  Mr. Kevin J. Dougherty

BancBoston Ventures, Inc.       100,000       600,000      17,750      106,500
100 Federal Street
Boston, MA  02110
Attn:  Ms. Marcia T. Bates

    TOTAL                     1,416,667    $8,500,002     250,000   $1,500,000


                                  Page 61 of 70


<PAGE>


                                    EXHIBIT 3


                                  Page 62 of 70


<PAGE>

                             STOCKHOLDERS' AGREEMENT


      AGREEMENT made this 6th day of November, 1996, by and among (i)
Occupational Health + Rehabilitation Inc, a Delaware corporation (the
"Company"), (ii) the individuals and entities listed under the heading "Holders"
on Schedule I attached hereto, and (ii) those persons whose names are set forth
under the heading "Investors" on Schedule I hereto (the "Investors").

      WHEREAS, the Investors are acquiring up to an aggregate of 1,666,667
shares of the Series A Preferred Stock, $.001 par value per share, of the
Company (the "Series A Preferred Stock") pursuant to a certain Series A
Convertible Preferred Stock Purchase Agreement dated as of November 6, 1996, by
and among the Investors and the Company (the "Purchase Agreement");

      NOW, THEREFORE, in consideration of the mutual covenants herein contained
and other good and valuable consideration, the receipt and sufficiency of which
is hereby acknowledged, the Company, the Holders and the Investors agree as
follows:

      1. Election of Directors.

            Each of the parries hereto agrees to vote all of the Stock (as
hereinafter defined) of the Company now owned or hereafter acquired by such
party (and attend, in person or by proxy, all meetings of stockholders called
for the purpose of electing directors), and the Company agrees to take all
actions (including, but not limited to the nomination of specified persons) to
cause and maintain the election to the Board of Directors of the Company, to the
extent permitted pursuant to the Company's Restated Certificate of
Incorporation, as amended, the following:

            (a) the Chief Executive Officer of the Company, who shall initially
be John C. Garbarino;

            (b) a person designated by those persons designated as Telor
Principal Stockholders on Schedule II hereto by a majority in interest of Stock
held by them, who shall initially be Angus M. Duthie;

            (c) a person designated by those persons designated as OH+R
Principal Stockholders on Schedule II hereto by a majority in interest of Stock
held by them, who shall initially be Kevin J. Dougherty;

            (d) two persons designated by Cahill, Warnock Strategic Partners
Fund, L.P., one of whom shall initially be Edward L. Cahill and the other of
whom shall be designated at a later date, and

            (e) two persons who shall be unaffiliated with the management of the
Company and mutually agreeable to all of the other directors.

            Each of the parties further covenants and agrees to vote, to the
extent possible, all shares of Stock of the Company now owned or hereafter
acquired by such party so that the Company's Board of Directors shall consist of

no more than seven (7) members. For the purposes of this Agreement, "Stock"
shall mean and include all Series A Preferred Stock and all shares of Common
Stock, and all other securities of the Company which may be exchangeable for or
issued in exchange for or in respect of shares of Common Stock (whether by way
of stock split, stock dividend, combination, reclassification, reorganization or
any other means).


                                  Page 63 of 70
<PAGE>

            In the absence of any designation from the persons or groups so
designating directors as specified above, the director previously designated by
them and then serving shall be reelected if still eligible to serve as provided
herein.

            No party hereto shall vote to remove any member of the Board of
Directors designated in accordance with the aforesaid procedure unless the
persons or groups so designating directors as specified above so vote, and, if
such persons or groups so vote then the non-designating party or parties shall
likewise so vote.

            Any vacancy on the Board of Directors created by the resignation,
removal, incapacity or death of any person designated under this Section I shall
be filled by another person designated in a manner so as to preserve the
constituency of the Board as provided above.

            If any party to this Agreement shall fail to vote such party's Stock
as provided in this Agreement, without further action by such party, the
President of the Company shall be, and hereby is, irrevocably constituted the
attorney-in-fact and proxy of such party for the purpose of voting the shares of
such Stock and shall vote the same in accordance with the terms of this
Agreement and is hereby authorized to revoke any proxy providing for any other
vote of such shares with respect to the election of directors.

      2. Termination. This Agreement, and the respective rights and obligations
of the parties hereto, shall terminate upon the earliest to occur of the
following: (i) the expiration of ten years from the date first written above;
(ii) a Mandatory Conversion pursuant to the terms of Paragraph 6O of the
Company's Certificate of Designations; or (iii) the sale of the Company, whether
by merger, sale, or transfer of more than eighty percent (80%) of its capital
stock, or sale of substantially all of its assets.

      3. Notices. All notices, requests, demands and other communications
provided for hereunder shall be in writing (including electronic communication)
and delivered personally, or by overnight courier, or by facsimile or other
electronic means or sent by certified or registered United States mail, postage
prepaid, return receipt requested and addressed as follows:

      If to any Investor: at such Investor's address for notice as set forth in
the register maintained by the Company, or, as to each of the foregoing, at the
addresses set forth on Schedule I hereto or at such other address as shall be
designated by such Person in a written notice to the other parries complying as
to delivery with the terms of this Section, with a copy to: Leslie E. Davis,

Esq., Testa, Hurwitz & Thibeault, LLP, High Street Tower, 125 High Street
Boston, Massachusetts 02110.

      If to the Company: at 175 Derby Street, Suite 36, Hingham, Massachusetts
02043, or at such other address as shall be designated by the Company in a
written notice to the other parties complying as to delivery with the terms of
this Section, with a copy to Donna L. Brooks, Esq., Shipman & Goodwin LLP, One
American Row, Hartford, CT 06103.

      All such notices, requests, demands and other communications shall be
effective three days after deposited in the mails or upon receipt when delivered
electronically, by facsimile, by hand or by overnight courier, respectively,
addressed as aforesaid, unless otherwise provided herein.

      4. Specific Performance. The rights of the parties under this Agreement
are unique and, accordingly, the parties shall, in addition to such other
remedies as may be available to any of them at law or in equity, have the right
to enforce their rights hereunder by actions for specific performance to the
extent permitted by law.


                                  Page 64 of 70
<PAGE>

      5. Entire Agreement. This Agreement constitutes the entire agreement among
the parties with respect to the subject matter hereof and supersedes all prior
agreements and understandings between them or any of them as to such subject
matter, including, without limitation, that certain Voting Agreement of the
Company dated as of June 6, 1996.

      6. Waivers and Further Agreements. Any of the provisions of this Agreement
may be waived with the consent of the Investors holding at a majority in
interest of the issued and outstanding shares of Series A Preferred Stock
(including shares of Common Stock into which any such shares may have been
converted) then held or deemed to be held by all Investors by an instrument in
writing. Any waiver by any party of a breach of any provision of this Agreement
shall not operate or be construed as a waiver of any subsequent breach of that
provision or of any other provision hereof. Each of the parties hereto agrees to
execute all such further instruments and documents and to take all such further
action as any other party may reasonably require in order to effectuate the
terms and purposes of this Agreement. Notwithstanding the foregoing, no waiver
approved in accordance herewith shall be effective if and to the extent that
such waiver grants to any one or more Investors any rights more favorable than
any rights granted to all other Investors or otherwise treats any one or more
Investors differently than all other Investors.

      7. Amendments. Except as otherwise expressly provided herein, this
Agreement may not be amended except by an instrument in writing executed by (i)
the Company, (ii) Investors holding a majority in interest of the issued and
outstanding shares of Series A Preferred Stock (including shares of Common Stock
into which any such shares may have been converted), and (iii) Holders holding a
majority of the shares of Common Stock subject to this Agreement.
Notwithstanding the foregoing, no such amendment shall be effective if and to
the extent that such amendment creates any additional affirmative obligations to

be complied with by any or all of the Investors.

      8. Assignment; Successors and Assigns. This Agreement shall be binding
upon and shall inure to the benefit of the parties hereto and their respective
heirs, executors, legal representatives, successors and permitted transferees.

      9. Severability. In case any one or more of the provisions contained in
this Agreement shall for any reason be held to be invalid, illegal or
unenforceable in any respect, such invalidity, illegality or unenforceability
shall not affect any other provision of this Agreement, and such invalid,
illegal and unenforceable provision shall be reformed and construed so that it
will be valid, legal and enforceable to the maximum extent permitted by law.

      10. Counterparts. This Agreement may be executed in two or more
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

      11. Section Headings. The headings contained in this Agreement are for
reference purposes only and shall not in any way affect the meaning or
interpretation of this Agreement,

      12. Governing Law. This Agreement shall be construed and enforced in
accordance with and governed by the General Corporation Law of the State of
Delaware as to matters within the scope thereof, and as to all other matters
shall be governed by and construed in accordance with the internal laws of the
Commonwealth of Massachusetts.

      13. Legend. The certificates representing the shares of Series A Preferred
Stock shall bear a legend substantially in the following form:


                                  Page 65 of 70
<PAGE>

      "The shares represented by this certificate are subject to the terms and
conditions of a Stockholders' Agreement dated as of November 6, 1996, a copy of
which will be furnished to any interested party upon written request without
charge."

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK)


                                  Page 66 of 70
<PAGE>

      IN WITNESS WHEREOF, the parties hereto have executed this Stockholders'
Agreement as a sealed instrument as of the day and date first above written.

INVESTORS:                                THE COMPANY:

CAHILL, WARNOCK STRATEGIC                 OCCUPATIONAL HEALTH +
  PARTNERS FUND, L.P.                       REHABILITATION INC



By: Cahill, Warnock Strategic
      Partners, L.P.                      By:___________________________________


By:______________________________         HOLDERS:
Title: General Partner


STRATEGIC ASSOCIATES, L.P.                PRINCE VENTURE, PARTNERS III
                                            LIMITED PARTNERSHIP
By: Cahill, Warnock & Company, LLC
                                          By: Prince Ventures, L.P., 
                                                General Partner

By:______________________________
Title: Managing Member By:


AXA U.S. GROWTH FUND, LLC                 *THE VENTURE CAPITAL FUND OF
                                             NEW ENGLAND III, L.P.

By:_______________________________        By: FH & Co. III, L.P., 
Title: Managing Member                          Its General Partner

                                          By:___________________________________


U.S. GROWTH FUND PARTNERS,
  C.V.
                                          *BANCBOSTON VENTURES, INC.

By________________________________
Title: General Partner By:

DOUBLE BLACK DIAMOND II, LLC
                                          ______________________________________
                                          John C. Garbarino

By:_______________________________
Title: Managing Member


                                  Page 67 of 70
<PAGE>

                                          ______________________________________
                                          Lynne M. Rosen
ALMANORI LIMITED

                                          VENROCK ASSOCIATES

By:_______________________________
Title: Attorney-in-Fact By:
                                          By:___________________________________


                                          *VENROCK ASSOCIATES II, L.P.


                                          By:___________________________________


                                          *ASSET MANAGEMENT ASSOCIATES,
                                          1989, L.P.

                                          By: AMC Partners 89, L.P., 
                                                General Partner


                                          By:___________________________________


*In their capacities as Holders and Investors hereunder.


                                  Page 68 of 70


<PAGE>


                                    EXHIBIT 4



                                  Page 69 of 70


<PAGE>

                                POWER OF ATTORNEY

            KNOWN ALL MEN BY THESE PRESENTS that each person whose signature
appears below constitutes and appoints Kimberley A. Rummelsburg and Ted H.
McCourtney his or her true and lawful attorneys-in-fact and agents, each acting
alone, with full power of substitution and resubstitution, for him or her and in
his or her name, place and stead, in any and all capacities, to sign the
Schedule 13D, and all amendments thereto, with all exhibits thereto, and all
documents in connection therewith, with respect to the beneficial ownership by
the undersigned of the equity securities of Occupational Health + Rehabilitation
Inc. and to file the same, with the Securities and Exchange Commission and any
other person, granting unto the attorneys-in-fact and agents, and each of them,
full power and authority to do and perform each and every act and thing
requisite and necessary to be done in and about the premises, as fully to all
intents and purposes as he or she might or could do in person, and hereby
ratifies and confirms all that said attorneys-in-fact and agents, each acting
alone, or their substitute or substitutes, may lawfully do or cause to be done.


November 19, 1996                       /s/ Peter O. Crisp
                                        -------------------------------------
                                          Peter O. Crisp
                                          General Partner

                                        /s/ Anthony B. Evnin
                                        -------------------------------------
                                          Anthony B. Evnin
                                          General Partner

                                        /s/ David R. Hathaway
                                        -------------------------------------
                                          David R. Hathaway
                                          General Partner

                                        /s/ Ted. H. McCourtney
                                        -------------------------------------
                                          Ted H. McCourtney
                                          General Partner

                                        /s/ Ray A. Rothrock
                                        -------------------------------------
                                          Ray A. Rothrock
                                          General Partner

                                        /s/ Kimberley A. Rummelsburg
                                        -------------------------------------
                                          Kimberley  A. Rummelsburg
                                          General Partner

                                        /s/ Patrick F. Latterell
                                        -------------------------------------
                                          Patrick F. Latterell

                                          General Partner

                                        /s/ Anthony Sun
                                        -------------------------------------
                                          Anthony Sun
                                          General Partner


                                  Page 70 of 70



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