Chairman of the Board, CEO and President
Bill Klesse serves as Chairman of the Board, Chief Executive Officer, and President of Valero Energy Corporation.
Klesse began his 40-year career in refining as an engineering trainee with Diamond Shamrock before accepting a position as a junior process engineer at the McKee refinery. He quickly rose to various managerial positions in engineering, petrochemical feedstocks, planning and development and marketing before being named Vice President of Logistics and Strategy of an R&M unit in 1982. In 1984, he was named Director of Corporate Development at Diamond Shamrock's Dallas office and, subsequently, Vice President. In 1987 he relocated to Diamond Shamrock's San Antonio office as an Executive Vice President. After the 1996 merger of Ultramar Corp. and Diamond Shamrock, forming Ultramar Diamond Shamrock (UDS), Klesse served as Executive Vice President of the company’s refining operations.
After Valero acquired UDS in 2001, Klesse served as Executive Vice President of Refining and Commercial Operations. In 2003, he was named Valero’s Executive Vice President and Chief Operating Officer. In 2006, Klesse became CEO, and in 2007, Chairman of the Board.
Klesse holds a Bachelor of Science degree in chemical engineering from the University of Dayton, and a Master of Business Administration degree in finance from West Texas A&M University.