A native of Tulsa, Oklahoma, Mr. Humphreys earned a Bachelor of Science in Industrial Engineering and Management from Oklahoma State University in 1971. He served in the U.S. Army from 1972-1974. He obtained an M.B.A. from the Wharton School of the University of Pennsylvania before joining Exxon Chemical Company in 1976. In 1986, after several assignments in Houston, Baton Rouge and Baytown, he transferred to Exxon Corporation in New York as Senior Financial Advisor in the Controller's Department. In 1988, he moved to Exxon Company, International as Financial Reporting Manager and later served as General Auditor. In 1990, Humphreys became Upstream Controller of Exxon Company, U.S.A.
In 1993, he moved to Kuala Lumpur, Malaysia, as Financial Director of the Exxon companies in Malaysia. Humphreys became an Assistant Treasurer of Exxon Corporation in January 1997 and was elected Vice President and Controller in July 1997.
Concurrent with the merger with Mobil in 1999, Humphreys was named Vice President and Controller of Exxon Mobil Corporation. In July 2004, he was named Vice President and Treasurer of Exxon Mobil Corporation. He was elected Senior Vice President and Treasurer and also joined the Corporation's Management Committee effective January 1, 2006.
Mr. Humphreys serves on the Board of Governors of the Oklahoma State University Foundation. In 2007, he was named a Distinguished Alumni of OSU and was inducted into the Spears School of Business Hall of Fame. He serves as a Director on the boards of Texas Parks and Wildlife Foundation, Junior Achievement and Council of the Americas. He is a member of Financial Executives International, the American Petroleum Institute and the Conference Board's Council of Financial Executives. He recently served as a member of the Financial Accounting Standards Advisory Council.