Directors
| Kent P. Dauten President, Keystone Capital |
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| Pascal J. Goldschmidt, M.D. Senior Vice President for Medical Affairs and Dean of the University of Miami Leonard M. Miller School of Medicine |
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| Donald E. Kiernan Senior Executive Vice President and Chief Financial Officer (retired), SBC Communications, Inc. |
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| Robert A. Knox Senior Managing Director, Cornerstone Equity Investors, L.L.C. |
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| Gary D. Newsome President and Chief Executive Officer |
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| Vicki A. O'Meara Executive Vice President and Chief Legal and Compliance Officer, Pitney Bowes, Inc. |
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| William J. Schoen Chairman of the Board, Health Management Associates, Inc. |
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| William C. Steere, Jr. Chairman Emeritus of Pfizer, Inc. |
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| Randolph W. Westerfield, Ph.D. Dean Emeritus and Charles B. Thornton Professor of Finance, Marshall School of Business, University of Southern California |
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