EXHIBIT 24 EXXON CORPORATION POWER OF ATTORNEY Each person whose signature appears below hereby constitutes and appoints Frank A. Risch, Richard E. Gutman and Millie P. Bradley, and each of them, with full power to act without the other, his or her true and lawful attorneys-in-fact and agents, with full power of substitution and resubstitution, for him or her and in his or her own name, place and stead, in any and all capacities, to sign a Registration Statement on Form S-4 relating to the issuance of the registrant's common stock in connection with the merger of Mobil Corporation with and into a wholly-owned subsidiary of the registrant and any and all amendments (including post-effective amendments and other amendments thereto) to such Registration Statement and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing as he or she could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents or any of them, or their or his or her substitute or substitutes, may lawfully do or cause to be done by virtue hereof. Signature Title Date --------- ----- ---- /s/ Lee R. Raymond Chairman of the Board February 24, 1999 - ------------------------------- (Lee R. Raymond) /s/ Michael J. Boskin Director March 10, 1999 - ------------------------------- (Michael J. Boskin) /s/ Rene Dahan Director February 24, 1999 - ------------------------------- (Rene Dahan) /s/ William T. Esrey Director February 24, 1999 - ------------------------------- (William T. Esrey) /s/ Jess Hay Director February 24, 1999 - ------------------------------- (Jess Hay) /s/ James R. Houghton Director February 24, 1999 - ------------------------------- (James R. Houghton) /s/ William R. Howell Director February 24, 1999 - ------------------------------- (William R. Howell) /s/ Reatha Clark King Director February 24, 1999 - ------------------------------- (Reatha Clark King) /s/ Philip E. Lippincott Director February 24, 1999 - ------------------------------- (Philip E. Lippincott) /s/ Harry J. Longwell Director February 24, 1999 - ------------------------------- (Harry J. Longwell) /s/ Marilyn Carlson Nelson Director February 26, 1999 - ------------------------------- (Marilyn Carlson Nelson) /s/ Walter V. Shipley Director February 24, 1999 - ------------------------------- (Walter V. Shipley) Signature Title Date --------- ----- ---- /s/ Robert E. Wilhelm Director February 24, 1999 - ------------------------------- (Robert E. Wilhelm) /s/ Frank A. Risch Treasurer February 24, 1999 - ------------------------------- (Principal (Frank A. Risch) Financial Officer) /s/ Donald D. Humphreys Controller February 24, 1999 - ------------------------------- (Principal (Donald D. Humphreys) Accounting Officer)