Marianne Lamont Horinko
Marianne Lamont Horinko served as Acting Administrator of the United States Environmental Protection Agency from July 14, 2003 to November 5, 2003 during the first term of President George W. Bush. Prior to this appointment Horinko was Assistant Administrator for the Office of Solid Waste and Emergency Response at EPA, having been confirmed by the U.S. Senate on October 1, 2001. She continued on as Assistant Administrator until June 1, 2004.
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Source: Wikipedia