<PAGE>   1
                                                                      Exhibit 24

                                     KEYCORP

                                POWER OF ATTORNEY


         The undersigned, an officer or director, or both an officer and
director of KeyCorp, an Ohio corporation, which anticipates filing with the
Securities and Exchange Commission, Washington, D.C., under the provisions of
the Securities Act of 1933, as amended, such registration statements or
amendments to existing registration statements (on Form S-3, Form S-4 or such
other form or forms as applicable) to effect the shelf registration pursuant to
Rule 415 (or other applicable rules) of the Securities and Exchange Commission
of up to 632,183 Common Shares, with a par value of $1 each, of KeyCorp (and the
associated rights), previously issued to the shareholders of NTH Holdings, Inc.
and to be sold from time to time in one or more offerings, hereby constitutes
and appoints K. Brent Somers, Thomas C. Stevens, Joseph M. Vayda and Daniel R.
Stolzer, and each of them, as attorney for the undersigned, with full power of
substitution and resubstitution for and in the name, place and stead of the
undersigned, to sign and file the proposed registration statements and any and
all amendments, post-effective amendments, and exhibits thereto, and any and all
applications and other documents to be filed with the Securities and Exchange
Commission pertaining to such securities or such registration with full power
and authority to do and perform any and all acts and things whatsoever requisite
and necessary to be done in the premises, hereby ratifying and approving the
acts of such attorney or any such substitute or substitutes.

         IN WITNESS WHEREOF, the undersigned has hereunto set his or her hand as
of September 23, 1999.




                                         By:  /s/ Robert W. Gillespie
                                              -------------------------------

<PAGE>   2



                                     KEYCORP

                                POWER OF ATTORNEY


         The undersigned, an officer or director, or both an officer and
director of KeyCorp, an Ohio corporation, which anticipates filing with the
Securities and Exchange Commission, Washington, D.C., under the provisions of
the Securities Act of 1933, as amended, such registration statements or
amendments to existing registration statements (on Form S-3, Form S-4 or such
other form or forms as applicable) to effect the shelf registration pursuant to
Rule 415 (or other applicable rules) of the Securities and Exchange Commission
of up to 632,183 Common Shares, with a par value of $1 each, of KeyCorp (and the
associated rights), previously issued to the shareholders of NTH Holdings, Inc.
and to be sold from time to time in one or more offerings, hereby constitutes
and appoints K. Brent Somers, Thomas C. Stevens, Joseph M. Vayda and Daniel R.
Stolzer, and each of them, as attorney for the undersigned, with full power of
substitution and resubstitution for and in the name, place and stead of the
undersigned, to sign and file the proposed registration statements and any and
all amendments, post-effective amendments, and exhibits thereto, and any and all
applications and other documents to be filed with the Securities and Exchange
Commission pertaining to such securities or such registration with full power
and authority to do and perform any and all acts and things whatsoever requisite
and necessary to be done in the premises, hereby ratifying and approving the
acts of such attorney or any such substitute or substitutes.

         IN WITNESS WHEREOF, the undersigned has hereunto set his or her hand as
of September 23, 1999.




                                           By:  /s/ K. Brent Somers
                                              --------------------------

<PAGE>   3






                                     KEYCORP

                                POWER OF ATTORNEY


         The undersigned, an officer or director, or both an officer and
director of KeyCorp, an Ohio corporation, which anticipates filing with the
Securities and Exchange Commission, Washington, D.C., under the provisions of
the Securities Act of 1933, as amended, such registration statements or
amendments to existing registration statements (on Form S-3, Form S-4 or such
other form or forms as applicable) to effect the shelf registration pursuant to
Rule 415 (or other applicable rules) of the Securities and Exchange Commission
of up to 632,183 Common Shares, with a par value of $1 each, of KeyCorp (and the
associated rights), previously issued to the shareholders of NTH Holdings, Inc.
and to be sold from time to time in one or more offerings, hereby constitutes
and appoints K. Brent Somers, Thomas C. Stevens, Joseph M. Vayda and Daniel R.
Stolzer, and each of them, as attorney for the undersigned, with full power of
substitution and resubstitution for and in the name, place and stead of the
undersigned, to sign and file the proposed registration statements and any and
all amendments, post-effective amendments, and exhibits thereto, and any and all
applications and other documents to be filed with the Securities and Exchange
Commission pertaining to such securities or such registration with full power
and authority to do and perform any and all acts and things whatsoever requisite
and necessary to be done in the premises, hereby ratifying and approving the
acts of such attorney or any such substitute or substitutes.

         IN WITNESS WHEREOF, the undersigned has hereunto set his or her hand as
of September 22, 1999.




                                                  By:  /s/ LEE G. IRVING
                                                     ------------------------


<PAGE>   4






                                     KEYCORP

                                POWER OF ATTORNEY


         The undersigned, an officer or director, or both an officer and
director of KeyCorp, an Ohio corporation, which anticipates filing with the
Securities and Exchange Commission, Washington, D.C., under the provisions of
the Securities Act of 1933, as amended, such registration statements or
amendments to existing registration statements (on Form S-3, Form S-4 or such
other form or forms as applicable) to effect the shelf registration pursuant to
Rule 415 (or other applicable rules) of the Securities and Exchange Commission
of up to 632,183 Common Shares, with a par value of $1 each, of KeyCorp (and the
associated rights), previously issued to the shareholders of NTH Holdings, Inc.
and to be sold from time to time in one or more offerings, hereby constitutes
and appoints K. Brent Somers, Thomas C. Stevens, Joseph M. Vayda and Daniel R.
Stolzer, and each of them, as attorney for the undersigned, with full power of
substitution and resubstitution for and in the name, place and stead of the
undersigned, to sign and file the proposed registration statements and any and
all amendments, post-effective amendments, and exhibits thereto, and any and all
applications and other documents to be filed with the Securities and Exchange
Commission pertaining to such securities or such registration with full power
and authority to do and perform any and all acts and things whatsoever requisite
and necessary to be done in the premises, hereby ratifying and approving the
acts of such attorney or any such substitute or substitutes.

         IN WITNESS WHEREOF, the undersigned has hereunto set his or her hand as
of September 23, 1999.




                                                     By:  /s/ Cecil D. Andrus
                                                         -----------------------

<PAGE>   5






                                     KEYCORP

                                POWER OF ATTORNEY


         The undersigned, an officer or director, or both an officer and
director of KeyCorp, an Ohio corporation, which anticipates filing with the
Securities and Exchange Commission, Washington, D.C., under the provisions of
the Securities Act of 1933, as amended, such registration statements or
amendments to existing registration statements (on Form S-3, Form S-4 or such
other form or forms as applicable) to effect the shelf registration pursuant to
Rule 415 (or other applicable rules) of the Securities and Exchange Commission
of up to 632,183 Common Shares, with a par value of $1 each, of KeyCorp (and the
associated rights), previously issued to the shareholders of NTH Holdings, Inc.
and to be sold from time to time in one or more offerings, hereby constitutes
and appoints K. Brent Somers, Thomas C. Stevens, Joseph M. Vayda and Daniel R.
Stolzer, and each of them, as attorney for the undersigned, with full power of
substitution and resubstitution for and in the name, place and stead of the
undersigned, to sign and file the proposed registration statements and any and
all amendments, post-effective amendments, and exhibits thereto, and any and all
applications and other documents to be filed with the Securities and Exchange
Commission pertaining to such securities or such registration with full power
and authority to do and perform any and all acts and things whatsoever requisite
and necessary to be done in the premises, hereby ratifying and approving the
acts of such attorney or any such substitute or substitutes.

         IN WITNESS WHEREOF, the undersigned has hereunto set his or her hand as
of September 23, 1999.




                                              By:  /s/ William G. Bares
                                                  ----------------------------

<PAGE>   6






                                     KEYCORP

                                POWER OF ATTORNEY


         The undersigned, an officer or director, or both an officer and
director of KeyCorp, an Ohio corporation, which anticipates filing with the
Securities and Exchange Commission, Washington, D.C., under the provisions of
the Securities Act of 1933, as amended, such registration statements or
amendments to existing registration statements (on Form S-3, Form S-4 or such
other form or forms as applicable) to effect the shelf registration pursuant to
Rule 415 (or other applicable rules) of the Securities and Exchange Commission
of up to 632,183 Common Shares, with a par value of $1 each, of KeyCorp (and the
associated rights), previously issued to the shareholders of NTH Holdings, Inc.
and to be sold from time to time in one or more offerings, hereby constitutes
and appoints K. Brent Somers, Thomas C. Stevens, Joseph M. Vayda and Daniel R.
Stolzer, and each of them, as attorney for the undersigned, with full power of
substitution and resubstitution for and in the name, place and stead of the
undersigned, to sign and file the proposed registration statements and any and
all amendments, post-effective amendments, and exhibits thereto, and any and all
applications and other documents to be filed with the Securities and Exchange
Commission pertaining to such securities or such registration with full power
and authority to do and perform any and all acts and things whatsoever requisite
and necessary to be done in the premises, hereby ratifying and approving the
acts of such attorney or any such substitute or substitutes.

         IN WITNESS WHEREOF, the undersigned has hereunto set his or her hand as
of September 23, 1999.




                                              By:  /s/ Albert C. Bersticker
                                                  ----------------------------

<PAGE>   7






                                     KEYCORP

                                POWER OF ATTORNEY


         The undersigned, an officer or director, or both an officer and
director of KeyCorp, an Ohio corporation, which anticipates filing with the
Securities and Exchange Commission, Washington, D.C., under the provisions of
the Securities Act of 1933, as amended, such registration statements or
amendments to existing registration statements (on Form S-3, Form S-4 or such
other form or forms as applicable) to effect the shelf registration pursuant to
Rule 415 (or other applicable rules) of the Securities and Exchange Commission
of up to 632,183 Common Shares, with a par value of $1 each, of KeyCorp (and the
associated rights), previously issued to the shareholders of NTH Holdings, Inc.
and to be sold from time to time in one or more offerings, hereby constitutes
and appoints K. Brent Somers, Thomas C. Stevens, Joseph M. Vayda and Daniel R.
Stolzer, and each of them, as attorney for the undersigned, with full power of
substitution and resubstitution for and in the name, place and stead of the
undersigned, to sign and file the proposed registration statements and any and
all amendments, post-effective amendments, and exhibits thereto, and any and all
applications and other documents to be filed with the Securities and Exchange
Commission pertaining to such securities or such registration with full power
and authority to do and perform any and all acts and things whatsoever requisite
and necessary to be done in the premises, hereby ratifying and approving the
acts of such attorney or any such substitute or substitutes.

         IN WITNESS WHEREOF, the undersigned has hereunto set his or her hand as
of September 23, 1999.




                                            By:  /s/ Edward P. Campbell
                                               -------------------------------

<PAGE>   8






                                     KEYCORP

                                POWER OF ATTORNEY


         The undersigned, an officer or director, or both an officer and
director of KeyCorp, an Ohio corporation, which anticipates filing with the
Securities and Exchange Commission, Washington, D.C., under the provisions of
the Securities Act of 1933, as amended, such registration statements or
amendments to existing registration statements (on Form S-3, Form S-4 or such
other form or forms as applicable) to effect the shelf registration pursuant to
Rule 415 (or other applicable rules) of the Securities and Exchange Commission
of up to 632,183 Common Shares, with a par value of $1 each, of KeyCorp (and the
associated rights), previously issued to the shareholders of NTH Holdings, Inc.
and to be sold from time to time in one or more offerings, hereby constitutes
and appoints K. Brent Somers, Thomas C. Stevens, Joseph M. Vayda and Daniel R.
Stolzer, and each of them, as attorney for the undersigned, with full power of
substitution and resubstitution for and in the name, place and stead of the
undersigned, to sign and file the proposed registration statements and any and
all amendments, post-effective amendments, and exhibits thereto, and any and all
applications and other documents to be filed with the Securities and Exchange
Commission pertaining to such securities or such registration with full power
and authority to do and perform any and all acts and things whatsoever requisite
and necessary to be done in the premises, hereby ratifying and approving the
acts of such attorney or any such substitute or substitutes.

         IN WITNESS WHEREOF, the undersigned has hereunto set his or her hand as
of September 23, 1999.




                                          By:  /s/ Carol A. Cartwright
                                              ----------------------------

<PAGE>   9






                                     KEYCORP

                                POWER OF ATTORNEY


         The undersigned, an officer or director, or both an officer and
director of KeyCorp, an Ohio corporation, which anticipates filing with the
Securities and Exchange Commission, Washington, D.C., under the provisions of
the Securities Act of 1933, as amended, such registration statements or
amendments to existing registration statements (on Form S-3, Form S-4 or such
other form or forms as applicable) to effect the shelf registration pursuant to
Rule 415 (or other applicable rules) of the Securities and Exchange Commission
of up to 632,183 Common Shares, with a par value of $1 each, of KeyCorp (and the
associated rights), previously issued to the shareholders of NTH Holdings, Inc.
and to be sold from time to time in one or more offerings, hereby constitutes
and appoints K. Brent Somers, Thomas C. Stevens, Joseph M. Vayda and Daniel R.
Stolzer, and each of them, as attorney for the undersigned, with full power of
substitution and resubstitution for and in the name, place and stead of the
undersigned, to sign and file the proposed registration statements and any and
all amendments, post-effective amendments, and exhibits thereto, and any and all
applications and other documents to be filed with the Securities and Exchange
Commission pertaining to such securities or such registration with full power
and authority to do and perform any and all acts and things whatsoever requisite
and necessary to be done in the premises, hereby ratifying and approving the
acts of such attorney or any such substitute or substitutes.

         IN WITNESS WHEREOF, the undersigned has hereunto set his or her hand as
of September 23, 1999.




                                         By:  /s/ Thomas A. Commes
                                             -------------------------

<PAGE>   10






                                     KEYCORP

                                POWER OF ATTORNEY


         The undersigned, an officer or director, or both an officer and
director of KeyCorp, an Ohio corporation, which anticipates filing with the
Securities and Exchange Commission, Washington, D.C., under the provisions of
the Securities Act of 1933, as amended, such registration statements or
amendments to existing registration statements (on Form S-3, Form S-4 or such
other form or forms as applicable) to effect the shelf registration pursuant to
Rule 415 (or other applicable rules) of the Securities and Exchange Commission
of up to 632,183 Common Shares, with a par value of $1 each, of KeyCorp (and the
associated rights), previously issued to the shareholders of NTH Holdings, Inc.
and to be sold from time to time in one or more offerings, hereby constitutes
and appoints K. Brent Somers, Thomas C. Stevens, Joseph M. Vayda and Daniel R.
Stolzer, and each of them, as attorney for the undersigned, with full power of
substitution and resubstitution for and in the name, place and stead of the
undersigned, to sign and file the proposed registration statements and any and
all amendments, post-effective amendments, and exhibits thereto, and any and all
applications and other documents to be filed with the Securities and Exchange
Commission pertaining to such securities or such registration with full power
and authority to do and perform any and all acts and things whatsoever requisite
and necessary to be done in the premises, hereby ratifying and approving the
acts of such attorney or any such substitute or substitutes.

         IN WITNESS WHEREOF, the undersigned has hereunto set his or her hand as
of September 23, 1999.




                                          By:  /s/ Kenneth M. Curtis
                                               ---------------------------

<PAGE>   11






                                     KEYCORP

                                POWER OF ATTORNEY


         The undersigned, an officer or director, or both an officer and
director of KeyCorp, an Ohio corporation, which anticipates filing with the
Securities and Exchange Commission, Washington, D.C., under the provisions of
the Securities Act of 1933, as amended, such registration statements or
amendments to existing registration statements (on Form S-3, Form S-4 or such
other form or forms as applicable) to effect the shelf registration pursuant to
Rule 415 (or other applicable rules) of the Securities and Exchange Commission
of up to 632,183 Common Shares, with a par value of $1 each, of KeyCorp (and the
associated rights), previously issued to the shareholders of NTH Holdings, Inc.
and to be sold from time to time in one or more offerings, hereby constitutes
and appoints K. Brent Somers, Thomas C. Stevens, Joseph M. Vayda and Daniel R.
Stolzer, and each of them, as attorney for the undersigned, with full power of
substitution and resubstitution for and in the name, place and stead of the
undersigned, to sign and file the proposed registration statements and any and
all amendments, post-effective amendments, and exhibits thereto, and any and all
applications and other documents to be filed with the Securities and Exchange
Commission pertaining to such securities or such registration with full power
and authority to do and perform any and all acts and things whatsoever requisite
and necessary to be done in the premises, hereby ratifying and approving the
acts of such attorney or any such substitute or substitutes.

         IN WITNESS WHEREOF, the undersigned has hereunto set his or her hand as
of September 23, 1999.




                                          By:  /s/ Henry S. Hemmingway
                                              -----------------------------

<PAGE>   12






                                     KEYCORP

                                POWER OF ATTORNEY


         The undersigned, an officer or director, or both an officer and
director of KeyCorp, an Ohio corporation, which anticipates filing with the
Securities and Exchange Commission, Washington, D.C., under the provisions of
the Securities Act of 1933, as amended, such registration statements or
amendments to existing registration statements (on Form S-3, Form S-4 or such
other form or forms as applicable) to effect the shelf registration pursuant to
Rule 415 (or other applicable rules) of the Securities and Exchange Commission
of up to 632,183 Common Shares, with a par value of $1 each, of KeyCorp (and the
associated rights), previously issued to the shareholders of NTH Holdings, Inc.
and to be sold from time to time in one or more offerings, hereby constitutes
and appoints K. Brent Somers, Thomas C. Stevens, Joseph M. Vayda and Daniel R.
Stolzer, and each of them, as attorney for the undersigned, with full power of
substitution and resubstitution for and in the name, place and stead of the
undersigned, to sign and file the proposed registration statements and any and
all amendments, post-effective amendments, and exhibits thereto, and any and all
applications and other documents to be filed with the Securities and Exchange
Commission pertaining to such securities or such registration with full power
and authority to do and perform any and all acts and things whatsoever requisite
and necessary to be done in the premises, hereby ratifying and approving the
acts of such attorney or any such substitute or substitutes.

         IN WITNESS WHEREOF, the undersigned has hereunto set his or her hand as
of September 23, 1999.




                                           By:  /s/ Charles R. Hogan
                                               -------------------------

<PAGE>   13






                                     KEYCORP

                                POWER OF ATTORNEY


         The undersigned, an officer or director, or both an officer and
director of KeyCorp, an Ohio corporation, which anticipates filing with the
Securities and Exchange Commission, Washington, D.C., under the provisions of
the Securities Act of 1933, as amended, such registration statements or
amendments to existing registration statements (on Form S-3, Form S-4 or such
other form or forms as applicable) to effect the shelf registration pursuant to
Rule 415 (or other applicable rules) of the Securities and Exchange Commission
of up to 632,183 Common Shares, with a par value of $1 each, of KeyCorp (and the
associated rights), previously issued to the shareholders of NTH Holdings, Inc.
and to be sold from time to time in one or more offerings, hereby constitutes
and appoints K. Brent Somers, Thomas C. Stevens, Joseph M. Vayda and Daniel R.
Stolzer, and each of them, as attorney for the undersigned, with full power of
substitution and resubstitution for and in the name, place and stead of the
undersigned, to sign and file the proposed registration statements and any and
all amendments, post-effective amendments, and exhibits thereto, and any and all
applications and other documents to be filed with the Securities and Exchange
Commission pertaining to such securities or such registration with full power
and authority to do and perform any and all acts and things whatsoever requisite
and necessary to be done in the premises, hereby ratifying and approving the
acts of such attorney or any such substitute or substitutes.

         IN WITNESS WHEREOF, the undersigned has hereunto set his or her hand as
of September 23, 1999.




                                         By:  /s/ Douglas J. Mcgregor
                                             -----------------------------

<PAGE>   14






                                     KEYCORP

                                POWER OF ATTORNEY


         The undersigned, an officer or director, or both an officer and
director of KeyCorp, an Ohio corporation, which anticipates filing with the
Securities and Exchange Commission, Washington, D.C., under the provisions of
the Securities Act of 1933, as amended, such registration statements or
amendments to existing registration statements (on Form S-3, Form S-4 or such
other form or forms as applicable) to effect the shelf registration pursuant to
Rule 415 (or other applicable rules) of the Securities and Exchange Commission
of up to 632,183 Common Shares, with a par value of $1 each, of KeyCorp (and the
associated rights), previously issued to the shareholders of NTH Holdings, Inc.
and to be sold from time to time in one or more offerings, hereby constitutes
and appoints K. Brent Somers, Thomas C. Stevens, Joseph M. Vayda and Daniel R.
Stolzer, and each of them, as attorney for the undersigned, with full power of
substitution and resubstitution for and in the name, place and stead of the
undersigned, to sign and file the proposed registration statements and any and
all amendments, post-effective amendments, and exhibits thereto, and any and all
applications and other documents to be filed with the Securities and Exchange
Commission pertaining to such securities or such registration with full power
and authority to do and perform any and all acts and things whatsoever requisite
and necessary to be done in the premises, hereby ratifying and approving the
acts of such attorney or any such substitute or substitutes.

         IN WITNESS WHEREOF, the undersigned has hereunto set his or her hand as
of September 23, 1999.




                                          By:  /s/ Henry L. Meyer III
                                              ----------------------------

<PAGE>   15






                                     KEYCORP

                                POWER OF ATTORNEY


         The undersigned, an officer or director, or both an officer and
director of KeyCorp, an Ohio corporation, which anticipates filing with the
Securities and Exchange Commission, Washington, D.C., under the provisions of
the Securities Act of 1933, as amended, such registration statements or
amendments to existing registration statements (on Form S-3, Form S-4 or such
other form or forms as applicable) to effect the shelf registration pursuant to
Rule 415 (or other applicable rules) of the Securities and Exchange Commission
of up to 632,183 Common Shares, with a par value of $1 each, of KeyCorp (and the
associated rights), previously issued to the shareholders of NTH Holdings, Inc.
and to be sold from time to time in one or more offerings, hereby constitutes
and appoints K. Brent Somers, Thomas C. Stevens, Joseph M. Vayda and Daniel R.
Stolzer, and each of them, as attorney for the undersigned, with full power of
substitution and resubstitution for and in the name, place and stead of the
undersigned, to sign and file the proposed registration statements and any and
all amendments, post-effective amendments, and exhibits thereto, and any and all
applications and other documents to be filed with the Securities and Exchange
Commission pertaining to such securities or such registration with full power
and authority to do and perform any and all acts and things whatsoever requisite
and necessary to be done in the premises, hereby ratifying and approving the
acts of such attorney or any such substitute or substitutes.

         IN WITNESS WHEREOF, the undersigned has hereunto set his or her hand as
of September 23, 1999.




                                            By:  /s/ Steven A. Minter
                                                -------------------------

<PAGE>   16






                                     KEYCORP

                                POWER OF ATTORNEY


         The undersigned, an officer or director, or both an officer and
director of KeyCorp, an Ohio corporation, which anticipates filing with the
Securities and Exchange Commission, Washington, D.C., under the provisions of
the Securities Act of 1933, as amended, such registration statements or
amendments to existing registration statements (on Form S-3, Form S-4 or such
other form or forms as applicable) to effect the shelf registration pursuant to
Rule 415 (or other applicable rules) of the Securities and Exchange Commission
of up to 632,183 Common Shares, with a par value of $1 each, of KeyCorp (and the
associated rights), previously issued to the shareholders of NTH Holdings, Inc.
and to be sold from time to time in one or more offerings, hereby constitutes
and appoints K. Brent Somers, Thomas C. Stevens, Joseph M. Vayda and Daniel R.
Stolzer, and each of them, as attorney for the undersigned, with full power of
substitution and resubstitution for and in the name, place and stead of the
undersigned, to sign and file the proposed registration statements and any and
all amendments, post-effective amendments, and exhibits thereto, and any and all
applications and other documents to be filed with the Securities and Exchange
Commission pertaining to such securities or such registration with full power
and authority to do and perform any and all acts and things whatsoever requisite
and necessary to be done in the premises, hereby ratifying and approving the
acts of such attorney or any such substitute or substitutes.

         IN WITNESS WHEREOF, the undersigned has hereunto set his or her hand as
of September 23, 1999.




                                      By:  /s/ Bill R. Sanford
                                         ------------------------------

<PAGE>   17






                                     KEYCORP

                                POWER OF ATTORNEY


         The undersigned, an officer or director, or both an officer and
director of KeyCorp, an Ohio corporation, which anticipates filing with the
Securities and Exchange Commission, Washington, D.C., under the provisions of
the Securities Act of 1933, as amended, such registration statements or
amendments to existing registration statements (on Form S-3, Form S-4 or such
other form or forms as applicable) to effect the shelf registration pursuant to
Rule 415 (or other applicable rules) of the Securities and Exchange Commission
of up to 632,183 Common Shares, with a par value of $1 each, of KeyCorp (and the
associated rights), previously issued to the shareholders of NTH Holdings, Inc.
and to be sold from time to time in one or more offerings, hereby constitutes
and appoints K. Brent Somers, Thomas C. Stevens, Joseph M. Vayda and Daniel R.
Stolzer, and each of them, as attorney for the undersigned, with full power of
substitution and resubstitution for and in the name, place and stead of the
undersigned, to sign and file the proposed registration statements and any and
all amendments, post-effective amendments, and exhibits thereto, and any and all
applications and other documents to be filed with the Securities and Exchange
Commission pertaining to such securities or such registration with full power
and authority to do and perform any and all acts and things whatsoever requisite
and necessary to be done in the premises, hereby ratifying and approving the
acts of such attorney or any such substitute or substitutes.

         IN WITNESS WHEREOF, the undersigned has hereunto set his or her hand as
of September 23, 1999.




                                       By:  /s/ Ronald B. Stafford
                                           ----------------------------

<PAGE>   18






                                     KEYCORP

                                POWER OF ATTORNEY


         The undersigned, an officer or director, or both an officer and
director of KeyCorp, an Ohio corporation, which anticipates filing with the
Securities and Exchange Commission, Washington, D.C., under the provisions of
the Securities Act of 1933, as amended, such registration statements or
amendments to existing registration statements (on Form S-3, Form S-4 or such
other form or forms as applicable) to effect the shelf registration pursuant to
Rule 415 (or other applicable rules) of the Securities and Exchange Commission
of up to 632,183 Common Shares, with a par value of $1 each, of KeyCorp (and the
associated rights), previously issued to the shareholders of NTH Holdings, Inc.
and to be sold from time to time in one or more offerings, hereby constitutes
and appoints K. Brent Somers, Thomas C. Stevens, Joseph M. Vayda and Daniel R.
Stolzer, and each of them, as attorney for the undersigned, with full power of
substitution and resubstitution for and in the name, place and stead of the
undersigned, to sign and file the proposed registration statements and any and
all amendments, post-effective amendments, and exhibits thereto, and any and all
applications and other documents to be filed with the Securities and Exchange
Commission pertaining to such securities or such registration with full power
and authority to do and perform any and all acts and things whatsoever requisite
and necessary to be done in the premises, hereby ratifying and approving the
acts of such attorney or any such substitute or substitutes.

         IN WITNESS WHEREOF, the undersigned has hereunto set his or her hand as
of September 23, 1999.




                                     By:  /s/ Dennis W. Sullivan
                                         ------------------------------

<PAGE>   19






                                     KEYCORP

                                POWER OF ATTORNEY


         The undersigned, an officer or director, or both an officer and
director of KeyCorp, an Ohio corporation, which anticipates filing with the
Securities and Exchange Commission, Washington, D.C., under the provisions of
the Securities Act of 1933, as amended, such registration statements or
amendments to existing registration statements (on Form S-3, Form S-4 or such
other form or forms as applicable) to effect the shelf registration pursuant to
Rule 415 (or other applicable rules) of the Securities and Exchange Commission
of up to 632,183 Common Shares, with a par value of $1 each, of KeyCorp (and the
associated rights), previously issued to the shareholders of NTH Holdings, Inc.
and to be sold from time to time in one or more offerings, hereby constitutes
and appoints K. Brent Somers, Thomas C. Stevens, Joseph M. Vayda and Daniel R.
Stolzer, and each of them, as attorney for the undersigned, with full power of
substitution and resubstitution for and in the name, place and stead of the
undersigned, to sign and file the proposed registration statements and any and
all amendments, post-effective amendments, and exhibits thereto, and any and all
applications and other documents to be filed with the Securities and Exchange
Commission pertaining to such securities or such registration with full power
and authority to do and perform any and all acts and things whatsoever requisite
and necessary to be done in the premises, hereby ratifying and approving the
acts of such attorney or any such substitute or substitutes.

         IN WITNESS WHEREOF, the undersigned has hereunto set his or her hand as
of September 23, 1999.




                                      By:  /s/ Peter G. Ten Eyck, II
                                          -------------------------------