Jack F. Harper

Executive Vice President

Mr. Harper served as the Company’s Senior Vice President and Chief of Staff from November 2010 to January 2013. Mr. Harper joined the Company in July 2006 as Director of Investor Relations and Business Development and became Vice President — Business Development and Capital Markets in October 2007. Prior to joining the Company, Mr. Harper served in various capacities relating to finance, investor relations and business development at Unocal Corporation, Pure Resources, Inc. and Tom Brown, Inc. He is a graduate of Baylor University with a Bachelor of Business Administration degree in Finance.