Executive Officers

John D. Hart

John D.
HART
Sr. Vice President, CFO and Treasurer John D. Hart joined us as Vice President, Chief Financial Officer and Treasurer in November 2005.

John D. Hart joined us as Vice President, Chief Financial Officer and Treasurer in November 2005. He was promoted to Senior Vice President in May 2009. Prior to joining us, he was a Senior Audit Manager with Ernst & Young LLP. Mr. Hart was employed by Ernst & Young LLP from April 1998 to November 2005 and by Arthur Andersen LLP from December 1991 to April 1998, working with numerous public companies in a wide variety of securities and exchange matters and capital markets activities. He is a member of the American Institute of Certified Public Accountants and the Oklahoma Independent Petroleum Association. Mr. Hart serves on the executive board of the Greater Oklahoma City Chamber of Commerce, and the boards of directors of the Petroleum Club of Oklahoma City and the Myriad Gardens Foundation. Additionally, he serves on the Casady School Board of Trustees and the Oklahoma State University Foundation Board of Governors. Mr. Hart is a Certified Public Accountant and received a Bachelor of Science in Accounting and Finance and a Master’s of Science in Accounting from Oklahoma State University.

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