Executive Officers

John D. Hart

John D.
HART
Chairman and Chief Executive Officer 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. He is a member of the American Institute of Certified Public Accountants and the Oklahoma Independent Petroleum Association. Mr. Hart graduated from Oklahoma State University with a Master’s of Science in Accounting.

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