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Mr. Thorne has been one of our directors since December 1986. He was elected President and Chief Executive Officer in May 1987, and served as President until January 2002 and as Chief Executive Officer until December 31, 2006. He currently serves as the non-executive Chairman of our Board of Directors, and will continue to serve in that capacity until his retirement and resignation as a Class I Director become effective as of the adjournment of the Meeting. He was first elected Chairman of the Board of Directors in November 1987. In June 2006, Mr. Thorne became a member of the National Petroleum Council. He holds a Bachelor of Science Degree in Petroleum Engineering from The University of Texas at Austin and a Juris Doctorate Degree from Baylor University College of Law. He lives in Dallas, Texas. | 