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Shortcuts Press Center Recent News Releases		Corporate Governance: Board of Directors Board of Directors | Committees of the Board | Corporate Governance Guidelines | Director Independence Standards | Code of Conduct | Articles of Incorporation/By-Laws | Corporate Governance Frequently Asked Questions R. David Yost CEO AmerisourceBergen Corporation Aetna Director since 2002 R. David Yost is Chief Executive Officer and a director of AmerisourceBergen Corporation (pharmaceutical distributor), a position he assumed in August 2001. Mr. Yost has held various managerial and executive positions at AmerisourceBergen or its predecessor since 1974. He served as Executive Vice President - Operations of AmeriSource Health Corporation from 1995 to May 1997, when he was appointed President and Chief Executive Officer. In December 2000, Mr. Yost was appointed Chairman and Chief Executive Officer of AmeriSource Health, a position he held until August 2001 when AmeriSource Health merged with Bergen Brunswig Corporation to form AmerisourceBergen Corporation and Mr. Yost became President and Chief Executive Officer of AmerisourceBergen. Mr. Yost served as President of AmerisourceBergen until October 2002.