CHATTERJEE PURNENDU
SC 13G, 1999-02-12
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13G
                                 (Rule 13d-102)

             INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
           TO RULES 13d- 1(b)(c), AND (d) AND AMENDMENTS THERETO FILED
                            PURSUANT TO RULE 13d-2(b)
                                (Amendment No. )*

                         GLOBAL TELESYSTEMS GROUP, INC.
                         ______________________________
                                (Name of Issuer)


                          Common Stock, $0.10 Par Value
                         ______________________________
                         (Title of Class of Securities)

                                    37936U104
                                 ______________
                                 (CUSIP Number)

                                December 31, 1998
                      _____________________________________
                      (Date of Event which Requires Filing
                               of this Statement)



Check the  appropriate box to designate the rule pursuant to which this Schedule
is filed:

                           [ ] Rule 13d-1(b)
                           [ ] Rule 13d-1(c)
                           [X] Rule 13d-1(d)

* 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 the
disclosures provided in a prior cover page.

The information required in 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).







                         Continued on following page(s)
                               Page 1 of 23 Pages
                             Exhibit Index: Page 18




<PAGE>


                                  SCHEDULE 13G

     CUSIP No. 37936U104                                      Page 2 of 23 pages




1        Name of Reporting Person
         S.S. or I.R.S. Identification No. of Above Person

                George Soros  (in the capacity described herein)

2        Check the Appropriate Box If a Member of a Group*
                                                     a.  [ ]
                                                     b.  [X]

3        SEC Use Only

4        Citizenship or Place of Organization

                  UNITED STATES

                           5        Sole Voting Power
  Number of                                 8,099,047
   Shares
Beneficially               6        Shared Voting Power
  Owned By                                  0
    Each
  Reporting                7        Sole Dispositive Power
   Person                                   8,099,047
    With
                           8        Shared Dispositive Power
                                            0

9        Aggregate Amount Beneficially Owned by Each Reporting Person

                                        8,099,047

10       Check Box If the Aggregate Amount in Row (9) Excludes Certain Shares*
                                    [X]

11       Percent of Class Represented By Amount in Row (9)

                                    11.93%

12       Type of Reporting Person*

         IA



                      *SEE INSTRUCTIONS BEFORE FILLING OUT!




<PAGE>


                                  SCHEDULE 13G

     CUSIP No. 37936U104                                      Page 3 of 23 pages





1        Name of Reporting Person
         S.S. or I.R.S. Identification No. of Above Person

                Dr. Purnendu Chatterjee (in the capacity described herein)

2        Check the Appropriate Box If a Member of a Group*
                                                     a.  [ ]
                                                     b.  [x]

3        SEC Use Only

4        Citizenship or Place of Organization

                  UNITED STATES

                           5        Sole Voting Power
  Number of                                 1,695,200
   Shares
Beneficially               6        Shared Voting Power
  Owned By                                  0
    Each
  Reporting                7        Sole Dispositive Power
   Person                                   1,695,200
    With
                           8        Shared Dispositive Power
                                            0

9        Aggregate Amount Beneficially Owned by Each Reporting Person

                                          1,695,200

10       Check Box If the Aggregate Amount in Row (9) Excludes Certain Shares*
                                    [X]

11       Percent of Class Represented By Amount in Row (9)

                                    2.58%

12       Type of Reporting Person*

         IA




                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>


                                  SCHEDULE 13G

     CUSIP No. 37936U104                                      Page 4 of 23 pages






1        Name of Reporting Person
         S.S. or I.R.S. Identification No. of Above Person

                Chatterjee Advisors LLC

2        Check the Appropriate Box If a Member of a Group*
                                                     a.  [ ]
                                                     b.  [x]

3        SEC Use Only

4        Citizenship or Place of Organization

                  DELAWARE

                           5        Sole Voting Power
  Number of                                 1,139,645
   Shares
Beneficially               6        Shared Voting Power
  Owned By                                  0
    Each
  Reporting                7        Sole Dispositive Power
   Person                                   1,139,645
    With
                           8        Shared Dispositive Power
                                            0

9        Aggregate Amount Beneficially Owned by Each Reporting Person

                                    1,139,645

10       Check Box If the Aggregate Amount in Row (9) Excludes Certain Shares*
                                    [X]

11       Percent of Class Represented By Amount in Row (9)

                                    1.75%

12       Type of Reporting Person*

         OO; IA




                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>


                                  SCHEDULE 13G

     CUSIP No. 37936U104                                      Page 5 of 23 pages



1        Name of Reporting Person
         S.S. or I.R.S. Identification No. of Above Person

                Chatterjee Management Company

2        Check the Appropriate Box If a Member of a Group*
                                                     a.  [ ]
                                                     b.  [x]

3        SEC Use Only

4        Citizenship or Place of Organization

                  DELAWARE

                           5        Sole Voting Power
  Number of                                 1,139,645
   Shares
Beneficially               6        Shared Voting Power
  Owned By                                  0
    Each
  Reporting                7        Sole Dispositive Power
   Person                                   1,139,645
    With
                           8        Shared Dispositive Power
                                            0

9        Aggregate Amount Beneficially Owned by Each Reporting Person

                                       1,139,645

10       Check Box If the Aggregate Amount in Row (9) Excludes Certain Shares*
                                    [X]

11       Percent of Class Represented By Amount in Row (9)

                                    1.75%

12       Type of Reporting Person*

         CO; IA



                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>


                                  SCHEDULE 13G

     CUSIP No. 37936U104                                      Page 6 of 23 pages



1        Name of Reporting Person
         S.S. or I.R.S. Identification No. of Above Person

                Winston Partners II LLC

2        Check the Appropriate Box If a Member of a Group*
                                                     a.  [ ]
                                                     b.  [x]

3        SEC Use Only

4        Citizenship or Place of Organization

                  DELAWARE

                           5        Sole Voting Power
  Number of                                 378,881
   Shares
Beneficially               6        Shared Voting Power
  Owned By                                  0
    Each
  Reporting                7        Sole Dispositive Power
   Person                                   378,881
    With
                           8        Shared Dispositive Power
                                            0

9        Aggregate Amount Beneficially Owned by Each Reporting Person

                                           378,881

10       Check Box If the Aggregate Amount in Row (9) Excludes Certain Shares*
                                    [X]

11       Percent of Class Represented By Amount in Row (9)

                                    0.59%

12       Type of Reporting Person*

         OO; IV



                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>


                                  SCHEDULE 13G

     CUSIP No. 37936U104                                      Page 7 of 23 pages




1        Name of Reporting Person
         S.S. or I.R.S. Identification No. of Above Person

                Winston Partners II LDC

2        Check the Appropriate Box If a Member of a Group*
                                                     a.  [ ]
                                                     b.  [X]

3        SEC Use Only

4        Citizenship or Place of Organization

                  CAYMAN ISLANDS

                           5        Sole Voting Power
  Number of                                 760,764
   Shares
Beneficially               6        Shared Voting Power
  Owned By                                  0
    Each
  Reporting                7        Sole Dispositive Power
   Person                                   760,764
    With
                           8        Shared Dispositive Power
                                            0

9        Aggregate Amount Beneficially Owned by Each Reporting Person

                                          760,764

10       Check Box If the Aggregate Amount in Row (9) Excludes Certain Shares*
                                    [X]

11       Percent of Class Represented By Amount in Row (9)

                                    1.17%

12       Type of Reporting Person*

         OO; IV


                     *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>


                                  SCHEDULE 13G

     CUSIP No. 37936U104                                      Page 8 of 23 pages

               

1        Name of Reporting Person
         S.S. or I.R.S. Identification No. of Above Person

                Chatterjee Fund Management, L.P.

2        Check the Appropriate Box If a Member of a Group*
                                                     a.  [ ]
                                                     b.  [X]

3        SEC Use Only

4        Citizenship or Place of Organization

                  DELAWARE

                           5        Sole Voting Power
  Number of                                 555,555
   Shares
Beneficially               6        Shared Voting Power
  Owned By                                  0
    Each
  Reporting                7        Sole Dispositive Power
   Person                                   555,555
    With
                           8        Shared Dispositive Power
                                            0

9        Aggregate Amount Beneficially Owned by Each Reporting Person

                                    555,555

10       Check Box If the Aggregate Amount in Row (9) Excludes Certain Shares*
                                    [X]

11       Percent of Class Represented By Amount in Row (9)

                                    0.85%

12       Type of Reporting Person*

                  PN


                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>
                                                              Page 9 of 23 Pages
                                          


Item 1(a)         Name of Issuer:

                  Global TeleSystems Group, Inc.  (the "Issuer").

Item 1(b)         Address of the Issuer's Principal Executive Offices:

                  1751  Pinnacle  Drive,  North Tower,  12th Floor,  McLean,  VA
22102.

Item 2(a)         Name of Person Filing:

                  This  statement  is filed on behalf  of each of the  following
                  persons (collectively, the "Reporting Persons"):

                  i)       Mr. George Soros ("Mr. Soros");

                  ii)      Dr. Purnendu Chatterjee ("Dr. Chatterjee");

                  iii)     Chatterjee Advisors LLC ("Chatterjee Advisors");

                  iv)      Chatterjee     Management    Company     ("Chatterjee
                           Management");

                  v)       Winston Partners II LLC ("Winston LLC");

                  vi)      Winston Partners II LDC ("Winston LDC"); and

                  vii)     Chatterjee Fund Management, L.P. ("CFM").


                  This statement  relates to Shares (as defined herein) held for
the accounts  of: (i) Open Society  Institute,  a New York trust  ("OSI");  (ii)
Soros Foundation-Hungary,  a New York corporation ("Soros Hungary"); (iii) Soros
Charitable  Foundation,  a New York trust ("SCF");  and (iv) Soros  Humanitarian
Foundation,  a New York trust  ("Soros  Humanitarian").  Mr.  Soros  serves as a
trustee of each of OSI, SCF and Soros  Humanitarian,  and as a director of Soros
Hungary (collectively, the "Foundations").

                  This Statement also relates to Shares held for the accounts of
Winston LDC and Winston LLC. Chatterjee  Advisors,  a Delaware limited liability
company that is managed and controlled by Dr. Chatterjee, serves as the manager,
and is  responsible  for  supervising  the operations of each of Winston LDC and
Winston  LLC.  Chatterjee  Advisors  is also a  shareholder  of Winston  LDC and
Winston LLC.

                  Chatterjee Management,  a Delaware corporation that is managed
and  controlled  by Dr.  Chatterjee,  serves as  investment  advisor  to each of
Winston LDC and Winston LLC pursuant to investment  management contracts between
Chatterjee  Management,  Chatterjee Advisors and each of Winston LDC and Winston
LLC.


<PAGE>


                                                             Page 10 of 23 pages




                  Chatterjee Advisors, as the manager of each of Winston LDC and
Winston  LLC,  and  by  reason  of its  ability  as  manager  to  terminate  the
contractual  relationship  of  Winston  LDC  and  Winston  LLC  with  Chatterjee
Management  within 60 days, and Chatterjee  Management,  by reason of its voting
and  dispositive  power over securities held for the accounts of Winston LDC and
Winston  LLC,  may each be  deemed  to be the  beneficial  owner  of  securities
(including  the Shares)  held for the account of each of Winston LDC and Winston
LLC.

                  This  Statement also relates to Shares held for the account of
CFM. CFM is a Delaware limited  partnership.  Dr. Chatterjee is the sole general
partner of CFM.



Item 2(b)         Address of Principal Business Office or, if None, Residence:

                  The address of the principal  business  office of Mr. Soros is
888 Seventh Avenue, 33rd Floor, New York, NY 10106.

                  The address of the  principal  business  office of each of Dr.
Chatterjee,  Chatterjee Advisors, Chatterjee Management, Winston LLC, and CFM is
888 Seventh Avenue, 30th Floor, NewYork, NY 10106.

                  The address of the principal business office of Winston LDC is
Kaya Flamboyan 9, Willemstad, Curacao, Netherlands Antilles.


Item 2(c)         Citizenship:

                  i)       Mr. Soros is a citizen of the United States;

                  ii)      Dr. Chatterjee is a citizen of the United States;

                  iii)     Chatterjee  Advisors is a Delaware limited  liability
                           company;

                  iv)      Chatterjee Management is a Delaware corporation;

                  v)       Winston LLC is a Delaware limited liability company;

                  vi)      Winston  LDC is a  Cayman  Islands  exempted  limited
                           duration company; and

                  vii)     CFM is a Delaware limited partnership.


Item 2(d)         Title of Class of Securities:

                  Common Stock, $0.10 par value (the "Shares").
 .

Item 2(e)         CUSIP Number:

                         37936U104


<PAGE>


                                                             Page 11 of 23 pages
                  


Item 3.           If this  statement  is filed  pursuant  to Rule  13d-1(b),  or
                  13d-2(b), check whether the person filing is a:

                  This Item 3 is not applicable.

Item 4.           Ownership:

Item 4(a)         Amount Beneficially Owned:

                  As of December  31,  1998,  the number of Shares  which may be
                  deemed  to  have  been  beneficially  owned  by  each  of  the
                  Reporting Persons was as follows:

                  i)       Mr.  Soros may be deemed to have been the  beneficial
                           owner of 8,099,047  Shares.  This number  consists of
                           (a)  4,330,281  Shares  held for the  account  of OSI
                           (including  3,333,333  shares  subject to immediately
                           exercisable warrants),  (b) 3,074,199 Shares held for
                           the account of Soros Hungary, (c) 656,849 Shares held
                           for the  account of SCF,  and (d) 37,718  Shares held
                           for the account of Soros Humanitarian.

                  ii)      Dr.  Chatterjee  may  be  deemed  to  have  been  the
                           beneficial  owner of  1,695,200  Shares.  This number
                           consists of (a)  378,881  Shares held for the account
                           of Winston LLC  (including  185,184 Shares subject to
                           immediately exercisable warrants), (b) 760,764 Shares
                           held  for  the  account  of  Winston  LDC  (including
                           370,371  Shares  subject to  immediately  exercisable
                           warrants),   and  (c)  555,555   Shares   subject  to
                           immediately exercisable warrants held for the account
                           of CFM.

                  iii)     Chatterjee  Advisors  may be  deemed to have been the
                           beneficial  owner of  1,139,645  Shares.  This number
                           consists of (a)  378,881  Shares held for the account
                           of Winston LLC  (including  185,184 Shares subject to
                           immediately  exercisable  warrants)  and (b)  760,764
                           Shares held for the account of Winston LDC (including
                           370,371  Shares  subject to  immediately  exercisable
                           warrants).

                  iv)      Chatterjee  Management may be deemed to have been the
                           beneficial  owner of  1,139,645  Shares.  This number
                           consists of (a)  378,881  Shares held for the account
                           of Winston LLC  (including  185,184 Shares subject to
                           immediately  exercisable  warrants)  and (b)  760,764
                           Shares held for the account of Winston LDC (including
                           370,371  Shares  subject to  immediately  exercisable
                           warrants).

                  v)       Winston LLC may be deemed to have been the beneficial
                           owner of 378,881  Shares  (including  185,184  Shares
                           subject to immediately exercisable warrants) held for
                           its account.

                  vi)      Winston LDC may be deemed to have been the beneficial
                           owner of 760,764  Shares  (including  370,371  Shares
                           subject to immediately exercisable warrants) held for
                           its own account.

                  vii)     CFM may be deemed to have been the  beneficial  owner
                           of 555,555 Shares subject to immediately  exercisable
                           warrants.


<PAGE>


                                                             Page 12 of 23 pages


Item 4(b)         Percent of Class:

                  (i)      The number of Shares of which Mr. Soros may be deemed
                           to  have  been  the  beneficial   owner   constitutes
                           approximately  11.93% of the  total  number of Shares
                           outstanding  (assuming  the  conversion  of 3,333,333
                           warrants held for the account of OSI).

                  (ii)     The number of Shares of which Dr.  Chatterjee  may be
                           deemed to have been the beneficial owner  constitutes
                           approximately  2.58% of the  total  number  of Shares
                           outstanding  (assuming  the  conversion  of:  185,184
                           warrants held for the account of Winston LLC, 370,371
                           warrants  held for the  account  of  Winston  LDC and
                           555,555 warrants held for the account of CFM).

                  (iii)    The number of Shares of which Chatterjee Advisors may
                           be  deemed  to  have   been  the   beneficial   owner
                           constitutes  approximately  1.75% of the total number
                           of Shares  outstanding  (assuming  the  conversion of
                           185,184  warrants held for the account of Winston LLC
                           and 370,371  warrants held for the account of Winston
                           LDC).

                  (iv)     The number of Shares of which  Chatterjee  Management
                           may be  deemed  to have  been  the  beneficial  owner
                           constitutes  approximately  1.75% of the total number
                           of Shares  outstanding  (assuming  the  conversion of
                           185,184  warrants  held for the  account  of  Winston
                           LDC).

                  (v)      The  number  of Shares  of which  Winston  LLC may be
                           deemed to have been the beneficial owner  constitutes
                           approximately  0.59% of the  total  number  of Shares
                           outstanding   (assuming  the  conversion  of  185,184
                           warrants held for its own account).

                  (vi)     The  number  of Shares  of which  Winston  LDC may be
                           deemed to have been the beneficial owner  constitutes
                           approximately  1.17% of the  total  number  of Shares
                           outstanding   (assuming  the  conversion  of  370,371
                           warrants held for its own account).

                  (vii)    The  number  of  Shares of which CFM may be deemed to
                           have   been   the   beneficial   owner    constitutes
                           approximately  0.85% of the  total  number  of Shares
                           outstanding   (assuming  the  conversion  of  555,555
                           Shares warrants held for its own account).





<PAGE>


                                                             Page 13 of 23 pages


Item 4(c)         Number of shares as to which such person had:

     Mr. Soros
     ---------

     (i)   Sole power to vote or to direct the vote:                   8,099,047

     (ii)  Shared power to vote or to direct the vote:                         0

     (iii) Sole power to dispose or to direct the disposition of:      8,099,047

     (iv)  Shared power to dispose or to direct the disposition of:            0

     Dr. Chatterjee
     --------------

     (i)   Sole power to vote or to direct the vote:                   1,695,200

     (ii)  Shared power to vote or to direct the vote:                         0

     (iii) Sole power to dispose or to direct the disposition of:      1,695,200

     (iv)  Shared power to dispose or to direct the disposition of:            0


     Chatterjee Advisors
     -------------------

     (i)   Sole power to vote or to direct the vote:                   1,139,645

     (ii)  Shared power to vote or to direct the vote:                         0

     (iii) Sole power to dispose or to direct the disposition of:      1,139,645

     (iv)  Shared power to dispose or to direct the disposition of:            0

    
<PAGE>


                                                             Page 14 of 23 Pages
 

     Chatterjee Management
     ---------------------

     (i)   Sole power to vote or to direct the vote:                   1,139,645

     (ii)  Shared power to vote or to direct the vote:                         0

     (iii) Sole power to dispose or to direct the disposition of:      1,139,645

     (iv)  Shared power to dispose or to direct the disposition of:            0


     Winston LLC 
     -----------

     (i)   Sole power to vote or to direct the vote:                     378,881

     (ii)  Shared power to vote or to direct the vote:                         0

     (iii) Sole power to dispose or to direct the disposition of:        378,881

     (iv)  Shared power to dispose or to direct the disposition of:            0


     Winston LDC
     -----------

     (i)   Sole power to vote or to direct the vote:                     760,764

     (ii)  Shared power to vote or to direct the vote:                         0

     (iii) Sole power to dispose or to direct the disposition of:        760,764

     (iv)  Shared power to dispose or to direct the disposition of:            0


     CFM
     ---

     (i)   Sole power to vote or to direct the vote:                     555,555

     (ii)  Shared power to vote or to direct the vote:                         0

     (iii) Sole power to dispose or to direct the disposition of:        555,555

     (iv)  Shared power to dispose or to direct the disposition of:            0


<PAGE>


                                                             Page 15 of 23 pages



Item 5.           Ownership of Five Percent or Less of a Class:

                  This Item 5 is not applicable.

Item 6.           Ownership  of More than  Five  Percent  on  Behalf of  Another
                  Person:

                  (i)  OSI  has the  right  to  participate  in the  receipt  of
                  dividends  from,  and proceeds  from the sale of,  securities,
                  including the Shares held for its account.

                  (ii) Soros Hungary has the right to participate in the receipt
                  of dividends  from,  and proceeds from the sale of, the Shares
                  held for its account.

                  (iii) SCF has the  right to  participate  in  the  receipt  of
                  dividends  from,  and proceeds  from the sale of,  securities,
                  including the Shares held for its account.

                  (iv)  Soros Humanitarian  has the right to  participate in the
                  receipt of  dividends  from,  and  proceeds  from the sale of,
                  securities, including the Shares held for its account.

                  (v)   The members of Winston LLC have the right to participate
                  in the receipt of dividends  from,  and proceeds from the sale
                  of,  securities,  including  the Shares held by Winston LLC in
                  accordance with their ownership interests in Winston LLC.

                  (vi)  The  shareholders  of  Winston  LDC  have  the  right to
                  participate in the receipt of dividends from, or proceeds from
                  the sale of, the Shares held by Winston LDC in accordance with
                  their ownership interests in Winston LDC.

                  (vii) Dr.  Chatterjee as sole general  partner of CFM has sole
                  right to  participate  in the receipt of  dividends  from,  or
                  proceeds  from the  sale  of,  the any  Shares  received  upon
                  conversion of the Warrants held for its account.


                  The  inclusion of Shares held for the  accounts of OSI,  Soros
Hungary,  SCF and Soros  Humanitarian  herein shall not be an admission that Mr.
Soros  or any of the  Reporting  Persons  has or  may  be  deemed  to  have  had
beneficial  ownership of such Shares. Mr. Soros expressly  disclaims  beneficial
ownership of any Shares held  directly for the accounts of Winston LLC,  Winston
LDC and CFM. Dr.  Chatterjee  expressly  disclaims  beneficial  ownership of any
Shares held for the accounts of OSI, Soros Hungary,  SCF and Soros Humanitarian.
Each of  Chatterjee  Advisors  and  Chatterjee  Management  expressly  disclaims
beneficial  ownership of any Shares held for the accounts of OSI, Soros Hungary,
SCF, Soros  Humanitarian,  and CFM. Winston LLC expressly  disclaims  beneficial
ownership of any Shares held for the accounts of OSI, Soros Hungary,  SCF, Soros
Humanitarian,  Winston LDC and CFM. Winston LDC expressly  disclaims  beneficial
ownership of any Shares held for the accounts of OSI, Soros Hungary,  SCF, Soros
Humanitarian,  Winston LLC and CFM. CFM expressly disclaims beneficial ownership
of any  Shares  held  for  the  accounts  of  OSI,  Soros  Hungary,  SCF,  Soros
Humanitarian, Winston LLC and Winston LDC.


<PAGE>


                                                             Page 16 of 23 pages



Item 7.           Identification  and  Classification  of the  Subsidiary  Which
                  Acquired the Security  Being Reported on by the Parent Holding
                  Company:

                           This Item 7 is not applicable.

Item 8.           Identification and Classification of Members of the Group:

                           This Item 8 is not applicable.

Item 9.           Notice of Dissolution of Group:

                           This Item 9 is not applicable.

Item 10.          Certification:

                           This Item 10 is not applicable.



<PAGE>


                                                             Page 17 of 23 pages



                                   SIGNATURES


After  reasonable  inquiry  and to the  best of my  knowledge  and  belief,  the
undersigned  certifies that the information set forth in this statement is true,
complete and correct.


Date:  February 12, 1999               GEORGE SOROS


                                       By:   /S/ MICHAEL C. NEUS
                                             -----------------------------------
                                             Michael C. Neus
                                             Attorney-in-Fact


Date:  February 12, 1999               PURNENDU CHATTERJEE


                                       By:   /S/ PETER HURWITZ
                                             -----------------------------------
                                             Peter Hurwitz
                                             Attorney-in-Fact


Date:  February 12, 1999               CHATTERJEE ADVISORS LLC


                                       By:   /S/  PETER HURWITZ
                                             -----------------------------------
                                             Peter Hurwitz
                                             Manager



Date:  February 12, 1999               CHATTERJEE MANAGEMENT COMPANY


                                       By:   /S/ PETER HURWITZ
                                             -----------------------------------
                                             Peter Hurwitz
                                             Vice-President


Date: February 12, 1999                WINSTON PARTNERS II LLC

                                       By:   Chatterjee Advisors LLC,
                                             its Manager


                                             By:  /S/  PETER HURWITZ
                                                  ------------------------------
                                                  Peter Hurwitz
                                                  Manager




Date: February 12, 1999                WINSTON PARTNERS II LDC


                                       By:   /S/ PETER HURWITZ
                                             -----------------------------------
                                             Peter Hurwitz
                                             Attorney-in-Fact


Date: February 12, 1999                CHATTERJEE FUND MANAGEMENT, L.P.

                                       By:   Purnendu Chatterjee,
                                             its General Partner


                                             By:  /S/  PETER HURWITZ
                                                  ------------------------------
                                                  Peter Hurwitz
                                                  Attorney-in-Fact





<PAGE>


                                                             Page 18 of 23 Pages





                                  EXHIBIT INDEX

                                                                            Page
                                                                            ----


A.                Power of Attorney dated January 1, 1997 granted
                  by Mr.  George  Soros in  favor of Mr.  Sean C.
                  Warren and Mr. Michael C. Neus.................             19

B.                Power of Attorney dated May 31, 1995 granted by
                  Dr.  Purnendu  Chatterjee in favor of Mr. Peter
                  Hurwitz........................................             20

C.                Power  of  Attorney   dated  October  25,  1996
                  granted by Winston  Partners II LDC in favor of
                  Mr. Peter Hurwitz..............................             21

D.                Joint Filing  Agreement dated February 11, 1999
                  by and among Mr.  George  Soros,  Dr.  Purnendu
                  Chatterjee, Chatterjee Advisors LLC, Chatterjee
                  Management  Company,  Winston  Partners II LLC,
                  Winston   Partners  II  LDC,   Chatterjee  Fund
                  Management, L.P................................             22







                                                             Page 19 of 23 pages


                                    EXHIBIT A


                                POWER OF ATTORNEY


KNOW ALL MEN BY THESE PRESENTS,  that I, GEORGE SOROS,  hereby make,  constitute
and appoint each of SEAN C. WARREN and MICHAEL C. NEUS, acting individually,  as
my agent and attorney-in-fact for the purpose of executing in my name, (a) in my
personal  capacity or (b) in my capacity as Chairman  of,  member of or in other
capacities  with  Soros  Fund  Management  LLC,  all  documents,   certificates,
instruments,  statements,  filings and agreements ("documents") to be filed with
or  delivered  to any foreign or domestic  governmental  or  regulatory  body or
required or  requested  by any other  person or entity  pursuant to any legal or
regulatory  requirement  relating to the acquisition,  ownership,  management or
disposition of securities or other investments, and any other documents relating
or ancillary  thereto,  including but not limited to, all documents  relating to
filings with the United States  Securities and Exchange  Commission  (the "SEC")
pursuant to the Securities  Act of 1933 or the  Securities  Exchange Act of 1934
(the "Act") and the rules and regulations promulgated thereunder, including: (1)
all documents relating to the beneficial  ownership of securities required to be
filed  with the SEC  pursuant  to  Section  13(d) or  Section  16(a) of the Act,
including, without limitation: (a) any acquisition statements on Schedule 13D or
Schedule  13G and  any  amendments  thereto,  (b) any  joint  filing  agreements
pursuant to Rule  13d-1(f) and (c) any initial  statements  of, or statements of
changes in,  beneficial  ownership of securities on Form 3, Form 4 or Form 5 and
(2) any  information  statements  on Form 13F  required to be filed with the SEC
pursuant to Section 13(f) of the Act.

All past acts of the attorney-in-fact in furtherance of the foregoing are hereby
ratified and confirmed.

This power of attorney shall be valid from the date hereof until revoked by me.

IN  WITNESS  WHEREOF,  I have  executed  this  instrument  as of this 1st day of
January, 1997.




                                  /s/George Soros
                                  ----------------------------------------------
                                  GEORGE SOROS









                                                             Page 20 of 23 Pages




                                    EXHIBIT B


                                POWER OF ATTORNEY


KNOW  ALL MEN BY THESE  PRESENTS,  that I,  PURNENDU  CHATTERJEE,  hereby  make,
constitute  and appoint PETER HURWITZ as my agent and  attorney-in-fact  for the
purpose  of  executing  in my name or in my  personal  capacity  all  documents,
certificates,  instruments,  statements, filings and agreements ("documents") to
be filed with or delivered to any foreign or domestic governmental or regulatory
body or  required or  requested  by any other  person or entity  pursuant to any
legal  or  regulatory  requirement  relating  to  the  acquisition,   ownership,
management or  disposition  of securities  or other  investments,  and any other
documents  relating  or  ancillary  thereto,  including  but not limited to, all
documents  relating to filings with the United  States  Securities  and Exchange
Commission  (the "SEC") pursuant to the Securities Act of 1933 or the Securities
Exchange  Act of 1934 (the  "Act")  and the rules  and  regulations  promulgated
thereunder, including: (1) all documents relating to the beneficial ownership of
securities  required  to be filed  with the SEC  pursuant  to  Section  13(d) or
Section 16(a) of the Act,  including,  without  limitation:  (a) any acquisition
statements on Schedule 13D or Schedule 13G and any amendments  thereto,  (b) any
joint filing agreements pursuant to Rule 13d-1(f) and (c) any initial statements
of, or statements of changes in,  beneficial  ownership of securities on Form 3,
Form 4 or Form 5 and (2) any  information  statements on Form 13F required to be
filed with the SEC pursuant to Section 13(f) of the Act.

All past acts of the attorney-in-fact in furtherance of the foregoing are hereby
ratified and confirmed.

This power of attorney shall be valid from the date hereof until revoked by me.

IN WITNESS WHEREOF,  I have executed this instrument as of this 31st day of May,
1995.




                                       /s/Purnendu Chatterjee
                                       -----------------------------------------
                                       PURNENDU CHATTERJEE











                                                             Page 21 of 23 Pages




                                    EXHIBIT C


                                POWER OF ATTORNEY


KNOW ALL MEN BY THESE PRESENTS,  that the  undersigned,  Winston Partners II LDC
(the "Company"),  a Cayman Islands exempted  limited  duration  company,  hereby
makes,  constitutes  and  appoints  PETER  HURWITZ  as the  Company's  agent and
attorney-in-fact  for the purpose of  executing  on behalf of the  Company,  all
documents,  certificates,   instruments,   statements,  filings  and  agreements
("documents")  to be  filed  with  or  delivered  to  any  foreign  or  domestic
governmental  or regulatory body or required or requested by any other person or
entity  pursuant  to  any  legal  or  regulatory  requirement  relating  to  the
acquisition,  ownership,  management  or  disposition  of  securities  or  other
investments,  and any other documents relating or ancillary  thereto,  including
but not limited to, all  documents  relating to filings  with the United  States
Securities and Exchange Commission (the "SEC") pursuant to the Securities Act of
1933 or the  Securities  Exchange  Act of 1934  (the  "Act")  and the  rules and
regulations promulgated thereunder, including: (1) all documents relating to the
beneficial ownership of securities required to be filed with the SEC pursuant to
Section 13(d) or Section 16(a) of the Act, including,  without  limitation:  (a)
any  acquisition  statements on Schedule 13D or Schedule 13G and any  amendments
thereto,  (b) any joint filing agreements  pursuant to Rule 13d-1(f) and (c) any
initial  statements  of, or  statements of changes in,  beneficial  ownership of
securities  on Form 3, Form 4 or Form 5 and (2) any  information  statements  on
Form 13F required to be filed with the SEC pursuant to Section 13(f) of the Act.

All past acts of the attorney-in-fact in furtherance of the foregoing are hereby
ratified and confirmed.

This power of attorney shall be valid from the date hereof until revoked by me.

IN WITNESS WHEREOF,  I have executed this instrument as of this 25th day of May,
1995.



                                     WINSTON PARTNERS II LDC


                                     By:      /s/Kieran Conroy /s/ Wiekert Weber
                                              ----------------------------------
                                     Name:    Kieran Conroy / Wiekert Weber







                                                             Page 22 of 23 Pages




                                    EXHIBIT D


                             JOINT FILING AGREEMENT

The undersigned  hereby agree that the statement on Schedule 13G with respect to
the Common Stock of Global TeleSystems Group, Inc. dated as of February 11, 1999
is, and any amendments thereto signed by each of the undersigned shall be, filed
on  behalf of us  pursuant  to and in  accordance  with the  provisions  of Rule
13d-1(f) under the Securities Exchange Act of 1934.


Date:  February 12, 1999               GEORGE SOROS


                                       By:   /S/ MICHAEL C. NEUS
                                             -----------------------------------
                                             Michael C. Neus
                                             Attorney-in-Fact


Date:  February 12, 1999               PURNENDU CHATTERJEE


                                       By:   /S/ PETER HURWITZ
                                             -----------------------------------
                                             Peter Hurwitz
                                             Attorney-in-Fact


Date:  February 12, 1999               CHATTERJEE ADVISORS LLC


                                       By:   /S/  PETER HURWITZ
                                             -----------------------------------
                                             Peter Hurwitz
                                             Manager



Date:  February 12, 1999               CHATTERJEE MANAGEMENT COMPANY


                                       By:   /S/ PETER HURWITZ
                                             -----------------------------------
                                             Peter Hurwitz
                                             Vice-President



<PAGE>


                                                             Page 23 of 23 Pages



Date: February 12, 1999                WINSTON PARTNERS II LLC

                                       By:   Chatterjee Advisors LLC,
                                             its Manager


                                             By:  /S/  PETER HURWITZ
                                                  ------------------------------
                                                  Peter Hurwitz
                                                  Manager




Date: February 12, 1999                WINSTON PARTNERS II LDC


                                       By:   /S/ PETER HURWITZ
                                             -----------------------------------
                                             Peter Hurwitz
                                             Attorney-in-Fact


Date: February 12, 1999                CHATTERJEE FUND MANAGEMENT, L.P.

                                       By:   Purnendu Chatterjee,
                                             its General Partner


                                             By:  /S/  PETER HURWITZ
                                                  ------------------------------
                                                  Peter Hurwitz
                                                  Attorney-in-Fact






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