J. Mark Lester

Executive Vice President -
Exploration

J. Mark Lester has been Executive Vice President - Exploration since April 2006. He served as Senior Vice President - Exploration from 1995 to March 2006 and served as Vice President - Exploration from 1989 to 1995. From 1986 to 1989, Mr. Lester was self-employed and acted as a consultant to Aubrey K. McClendon and Tom L. Ward. He was employed by various independent oil companies in Oklahoma City from 1980 to 1986, and was employed by Union Oil Company of California from 1977 to 1980 as a geophysicist. Mr. Lester graduated from Purdue University in 1975 and 1977.

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The information includes forward-looking statements, which are subject to known and unknown risks and uncertainties that could cause actual results to differ materially. We refer you to the discussion of risk factors that could affect future operating or financial performance in our most recent prospectus and Form 10-K and other SEC Filings. Chesapeake assumes no obligation to update any forward-looking statements made here as a result of new information or future events or developments. You will find a reconciliation of any non-GAAP financial measure, as defined by the SEC in Regulation G, to the most directly comparable GAAP number in Reconciliation of Non-GAAP Financial Measures.

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