Aubrey K. McClendon to Retire from the Company on April 1, 2013 Board Announces that its Extensive Review of Alleged Conflicts of Interest and Other Matters Involving McClendon Has to Date Found No Improper Conduct, Final Report to be Completed in Mid-February OKLAHOMA CITY--(BUSINESS WIRE)--Jan. 29, 2013-- Chesapeake Energy Corporation (NYSE:CHK) today announced that its Co-founder, Chief Executive Officer and President, Aubrey K. McClendon, has agreed to retire from the company on April 1, 2013 and will continue to serve as Chief Executive Officer until his successor is appointed. Mr. McClendon, 53, has served as Chesapeake’s Chief Executive Officer since the inception of the company in 1989 and served as Chairman of the Board from its founding until 2012. Archie W. Dunham, Chairman of the Board, stated: “Over the past 24 years, Aubrey McClendon has created one of the most valuable and innovative companies in the energy industry. Under Aubrey’s strong leadership, Chesapeake