Thomas Usher
Non-executive Chairman of the Board, Marathon Petroleum Corporation

Mr. Usher graduated from the University of Pittsburgh with a Bachelor of Science degree in industrial engineering, a Master of Science degree in operations research and a doctorate in systems engineering. He joined United States Steel Corporation (later renamed USX Corporation) in 1965 and held various positions in industrial engineering. From 1975 through 1979, he held a number of management positions at U.S. Steel's South and Gary Works. Mr. Usher was elected Executive Vice President of Heavy Products in 1986, President of U.S. Steel Group and Director of USX in 1991, President and Chief Operating Officer of USX in 1994 and Chairman of the Board and Chief Executive Officer effective July 1, 1995. He retired from United States Steel Corporation as Chief Executive Officer in September 2004 and as non-executive Chairman of the Board on February 1, 2006.

Mr. Usher serves on the Boards of Directors of H. J. Heinz Co., The PNC Financial Services Group, Inc. and PPG Industries, Inc. He previously served, within the past five years, as Chairman of the Board for United States Steel Corporation. Mr. Usher is a member of the Board of Trustees of the University of Pittsburgh, a Board of Directors member of the Extra Mile Education Foundation, and a member of The Business Council.