page_title: John M. Grunsfeld
hierarchical_section_title: John M. Grunsfeld
caption_attribution_description: English: Astronaut John M. Grunsfeld, payload commander, returns to the environment of the Space Shuttle Columbia's aft flight deck. Having completed a seven-hour space walk, Grunsfeld enters data in a lap top computer.
context_page_description: John Mace Grunsfeld is an American physicist and a former NASA astronaut. He is a veteran of five Space Shuttle flights 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 served as associate administrator of NASA's Science Mission Directorate. Grunsfeld announced his retirement from NASA in April 2016.
context_section_description: John Mace Grunsfeld (born October 10, 1958) is an American physicist and a former NASA astronaut. He is a veteran of five Space Shuttle flights 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 served as associate administrator of NASA's Science Mission Directorate (SMD). Grunsfeld announced his retirement from NASA in April 2016.
caption: John Grunsfeld during STS-109
   March 4, 2002
exif: {}