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LUKE R. CORBETT, 58, is Chairman and Chief Executive Officer of Kerr-McGee Corporation, which is engaged in oil and gas exploration and production and chemical operations. He has been employed by Kerr-McGee Corporation for more than 17 years, having served as Chairman and Chief Executive Officer since 1997; President and Chief Operating Officer from 1995 to 1997; and Group Vice President from 1992 to 1995. Mr. Corbett also serves as a member of the Board of Directors of BOK Financial Corporation and Noble Corporation. Mr. Corbett has been a director of the Company since December 31, 1996, and of OG&E since December 1, 1996, and is chairman of the compensation committee and is a member of the audit committee of the Board. | 