Scott Sheffield, a distinguished graduate of The University of Texas at Austin with a Bachelor of Science in Petroleum Engineering, is Executive Chairman of Pioneer Natural Resources. Mr. Sheffield recently retired as CEO after leading Pioneer for 31 years from a $32 million company to a $32 billion company with over 3500 employees. Pioneer is considered a leader in developing oil shale with primary focus in the second largest oil field in the world; the Spraberry Wolfcamp Field in West Texas. Besides Pioneer, Mr. Sheffield serves on the boards of Williams Companies and Santos Ltd. In addition, he also serves as an Advisory Director on the boards of Letter One Energy, National Petroleum Council, Maguire Energy Institute of the SMU Cox School of Business, and Columbia University’s SIPA Center on Global Energy Policy.