<PAGE>
Exhibit 24.1
POWER OF ATTORNEY
KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears
below constitutes and appoints James Dimon, Verne G. Istock, William P.
Boardman, Robert A. Rosholt, James L. Foorman, M. Eileen Kennedy and Laurence
Goldman, jointly and severally, his attorney-in-fact, each with power of
substitution, for him in any and all capacities to sign one or more Registration
Statements on Form S-3 relating to the offer and sale by certain stockholders of
common stock (the "Securities") of BANK ONE CORPORATION (the "Corporation") and
any amendments thereto (including any post-effective amendments) and any
subsequent registration statement filed by the Corporation pursuant to Rule
462(b) of the Securities Act of 1933 with respect to such Securities, in either
case pursuant to resolutions adopted by the Board of Directors of the
Corporation on April 18, 2000, and to file the same, with exhibits thereto, and
other documents in connection therewith, with the Securities and Exchange
Commission hereby ratifying and confirming all that each of said attorneys-in-
fact, or his substitute or substitutes, may do or cause to be done by virtue
hereof.
Signature Title
--------- -----
/s/ William P. Boardman Director
------------------------------
William P. Boardman
/s/ John H. Bryan Director
------------------------------
John H. Bryan
/s/ Siegfried Buschmann Director
------------------------------
Siegfried Buschmann
/s/ James S. Crown Director
------------------------------
James S. Crown
/s/ James Dimon Principal Executive Officer and Director
------------------------------
James Dimon
/s/ Bennett Dorrance Director
------------------------------
Bennett Dorrance
/s/ Dr. Maureen A. Fay, O.P. Director
------------------------------
Dr. Maureen A. Fay, O.P.
/s/ John R. Hall Director
------------------------------
John R. Hall
<PAGE>
/s/ Verne G. Istock Director
------------------------------
Verne G. Istock
/s/ Laban P. Jackson, Jr. Director
------------------------------
Laban P. Jackson, Jr.
/s/ John W. Kessler Director
------------------------------
John W. Kessler
/s/ Richard A. Manoogian Director
------------------------------
Richard A. Manoogian
/s/ William T. McCormick Director
------------------------------
William T. McCormick
/s/ Thomas E. Reilly, Jr. Director
------------------------------
Thomas E. Reilly, Jr.
/s/ John W. Rogers, Jr. Director
------------------------------
John W. Rogers, Jr.
/s/ Thekla R. Shackelford Director
------------------------------
Thekla R. Shackelford
/s/ Alex Shumate Director
------------------------------
Alex Shumate
/s/ Frederick P. Stratton, Jr. Director
------------------------------
Frederick P. Stratton, Jr.
______________________________ Director
Robert D. Walter
April 18, 2000
<PAGE>
/s/ James A. Peers Principal Accounting Officer
------------------------------
James A. Peers
May 1, 2000
<PAGE>
POWER OF ATTORNEY
KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears
below constitutes and appoints James Dimon, Verne G. Istock, William P.
Boardman, James L. Foorman, M. Eileen Kennedy and Laurence Goldman, jointly and
severally, his attorney-in-fact, each with power of substitution, for him in any
and all capacities to sign one or more Registration Statements on Form S-3
relating to the offer and sale by certain stockholders of common stock (the
"Securities") of BANK ONE CORPORATION (the "Corporation") and any amendments
thereto (including any post-effective amendments) and any subsequent
registration statement filed by the Corporation pursuant to Rule 462(b) of the
Securities Act of 1933 with respect to such Securities, in either case pursuant
to resolutions adopted by the Board of Directors of the Corporation on April 18,
2000, and to file the same, with exhibits thereto, and other documents in
connection therewith, with the Securities and Exchange Commission hereby
ratifying and confirming all that each of said attorneys-in-fact, or his
substitute or substitutes, may do or cause to be done by virtue hereof.
Signature Title
--------- -----
/s/ Charles W. Scharf Principal Financial Officer
--------------------------
Charles W. Scharf
June 12, 2000
