Dr. Michael Griffin is an American physicist and aerospace engineer. From April 13, 2005 to January 20, 2009 he served as Administrator of NASA, the space agency of the United States. As NASA Administrator Griffin oversaw such areas as the future of human spaceflight, the fate of the Hubble telescope and NASA's role in understanding climate change. In April 2009 Dr. Griffin, who has an academic background, was named eminent scholar and a professor of mechanical and aerospace engineering at The University of Alabama in Huntsville.

Griffin had worked at NASA prior to serving as NASA Administrator, including as Associate Administrator for Exploration. When he was nominated as NASA chief, he was head of the Space Department at the Johns Hopkins University Applied Physics Laboratory (APL) in Laurel, Maryland. While he describes himself modestly as "a simple aerospace engineer from a small town," Griffin has held several high-profile political appointments. In 2007, he was included in the TIME 100, the magazine's list of the 100 most influential people.

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