John M. Grunsfeld
John Mace Grunsfeld (born October 1958) is an American physicist and a former NASA astronaut. He is a veteran of five Space Shuttleflights and has served as NASA Chief Scientist. His academic background includes research in high energy astrophysics, cosmic ray physics and the emerging field of exoplanet studies with specific interest in future astronomical instrumentation. After retiring from NASA in 2009, he served as the Deputy Director of the Space Telescope Science Institute in Baltimore, Maryland. In January 2012, he returned to NASA and is currently serving as associate administrator of NASA's Science Mission Directorate (SMD).
Read more about John M. Grunsfeld: Personal, Education, Organizations, Awards and Honors, Science Career, NASA Career, Spaceflight Experience, Space Telescope Science Institute, Mountaineering
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