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John D. Clark has served as a director of our company since April 2002. Mr. Clark is a general partner of Welsh, Carson, Anderson & Stowe, a private equity investment firm, and affiliated entities, which collectively are a principal stockholder of our company. Prior to joining Welsh, Carson, Anderson & Stowe in 2000, Mr. Clark was a general partner at Saunders, Karp & Megrue, a private equity firm. Mr. Clark has also worked in the corporate finance group at Deutsche Banc Alex Brown and in the merchant banking department at Morgan Stanley & Co. Mr. Clark received a B.S. from Princeton University and a M.B.A. from Stanford University Graduate School of Business. | 