People: Pioneer Southwest Energy Partners LP (PSE)

Mr. Arthur L. Smith is Independent Director of Pioneer Natural Resources GP LLC., the General Partner of Pioneer Southwest Energy Partners L.P., since April 2008. Mr. Smith is President and Managing Member of Triple Double Advisors, LLC (an investment advisory firm focusing on the energy industry), a position he has held since August 2007. From 1984 to 2007, Mr. Smith was Chairman and CEO of John S. Herold, Inc. (a petroleum research and consulting firm). From 1976 to 1984, Mr. Smith was a securities analyst with Argus Research Corp., The First Boston Corporation and Oppenheimer & Co., Inc. Mr. Smith holds the CFA designation. Mr. Smith serves on the board of directors of PNGS GP LLC, the general partner of PAA Natural Gas Storage LP. He also serves on the board of non-profit Dress for Success Houston. Mr. Smith served on the board of directors of Plains All American GP LLC, the general partner of Plains All American Pipeline, L.P., from 1999 until 2010. Mr. Smith received a BA from Duke University and an MBA from NYU's Stern School of Business.