 | | Name : | Bruce L. Carter | | Title : | Chairman of the Board, Chief Executive Officer | | Since: | 04/1998 |
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 | | Name : | Douglas E. Williams | | Title : | President | | Since: | 11/01/2004 |
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 | | Name : | James A. Johnson | | Title : | Chief Financial Officer, Executive Vice President, Treasurer | | Since: | 02/2001 |
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 | | Name : | Suzanne M. Shema | | Title : | Senior Vice President, General Counsel, Secretary | | Since: | 12/2001 |
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| | Name : | Michael Dwyer | | Title : | Senior Vice President - Sales and Marketing | | Since: | 05/2006 |
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| | Name : | Darren R. Hamby | | Title : | Senior Vice President - Human Resources | | Since: | 07/01/2007 |
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| | Name : | Vaughn B. Himes | | Title : | Senior Vice President - Technical Operations | | Since: | 05/03/2006 |
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 | | Name : | Nicole M. Onetto | | Title : | Senior Vice President, Chief Medical Officer | | Since: | 09/2005 |
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