William "Bill" R. Klesse is CEO and President of Valero Energy Corporation, as well as Chairman of the Valero Board of Directors. Klesse held previous positions with Valero as Vice Chairman of the Board, Executive Vice President, and Chief Operating Officer. Prior to these roles, Klesse served as Executive Vice President-Refining and Commercial Operations from Valero's acquisition of Ultramar Diamond Shamrock Corporation (UDS) in 2001. Klesse has been employed with Valero and its predecessor companies for 40 years. Klesse graduated from the University of Dayton with a B.S. in chemical engineering. He received his master's degree in finance from West Texas A&M University.
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