R David Yost

Director and Chief Executive Officer of AmerisourceBergen since August 2001. President of AmerisourceBergen from August 2001 to October 2002 and since September 2007. Chairman and Chief Executive Officer of AmeriSource Health Corporation from December 2000 to August 2001 and President and Chief Executive Officer of AmeriSource Health Corporation from May 1997 to December 2000. Held variety of other positions with AmeriSource Health Corporation and its predecessors since 1974, including Executive Vice President - Operations of AmeriSource Health Corporation from 1995 to 1997. Also a director of Electronic Data Systems Corporation and PharMerica Corporation.