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Barrett A. Toan was the Chairman of Express Scripts Inc. from November 2000 until his retirement in May 2006 and the Chief Executive Officer of Express Scripts Inc. from March 1992 until his retirement in March 2005. Mr. Toan was an executive officer of Express Scripts Inc. from May 1989 until his retirement and served as the President from October 1990 to April 2002. Prior thereto Mr. Toan was an Executive Director and Chief Operating Officer of Sanus Health Plan of St. Louis. Mr. Toan continues to serves as a director of Express Scripts Inc. and is also a director of Sigma-Aldrich Corporation. He also serves as a director on a number of charitable organizations including the St. Louis Art Museum and Kenyon College. Mr. Toan received an M.P.A. from the Wharton School of Finance and Commerce at the University of Pennsylvania and a B.A. from Kenyon College. | 