Chemical Engineering

Chemical Engineering Experts

William R. Klesse

Chief Executive Officer and former Chairman
Chemical Engineering
Valero Energy Corporation (Valero)
United States of America

William R. Klesse


Mr. Klesse, 70, is the former Chief Executive Officer and former Chairman of the Board of Valero Energy Corporation (Valero), an international manufacturer and marketer of transportation fuels, other petrochemical products and power. He joined the Valero board as Vice Chairman in 2005 and served as Chairman of the Board from 2007 to December 2014. From 2006 to May 2014, he served as Chief Executive Officer of Valero and served as President from 2008 to 2013. From 2003 to 2005, Mr. Klesse was Valero's Executive Vice President and Chief Operating Officer. Prior to that, he served as Executive Vice President of Refining and Commercial Operations following Valero's 2001 acquisition of Ultramar Diamond Shamrock Corporation, where he had been Executive Vice President of the company's refining operations. Mr. Klesse began his 40-plus year career in the energy industry at Diamond Shamrock Corporation, which merged with Ultramar Corporation in 1996. Mr. Klesse serves on the Board of Directors of MEG Energy. Mr. Klesse is a trustee of the Texas Biomedical Research Institute and United Way of San Antonio and Bexar County and serves on the Advisory Board of the San Antonio Food Bank. Mr. Klesse holds a bachelor's degree in Chemical Engineering from the University of Dayton and a Master of Business Administration with an emphasis in Finance from West Texas A&M University. Qualifications: Mr. Klesse brings more than four decades of energy industry executive management experience to Occidental's Board. As Valero's former Chairman, he led the Board's strategic planning and, as Valero's former Chief Executive Officer, he oversaw the daily operations of a major global energy company. Mr. Klesse's experience provides an informed management perspective and insights with respect to global business and energy issues to the Board. He also has leadership experience on industry association and nonprofit boards. 

Research Interest

 Transportation fuels,Petrochemical 

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