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William R. Klesse
American businessman · United States · On the map · Founders · Born 1947 · age 79
William "Bill" R. Klesse is the former chairman of the board for Valero Energy Corporation. He was chief executive officer from December 31, 2005, to April 30, 2014, and President from January 17, 2008, to December 31, 2012.
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He previously held positions with Valero as Vice Chairman of the Board, Executive Vice President, and Chief Operating Officer. Prior to that time, he was the Chief Operating Officer of Valero Energy Corp. from January 2003 to January 3, 2006. Before these roles, he was 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.
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