John 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).
Spaceflights:
No. Mission Position Time Duration
1 STS-67 MSP 02.03. - 18.03.1995 16d 15h 08m
2 STS-81 MSP 12.01. - 22.01.1997 10d 04h 56m
3 STS-103 MSP 20.12. - 28.12.1999 7d 23h 11m
4 STS-109 MSP 01.03. - 12.03.2002 10d 22h 10m
5 STS-125 MSP 11.05. - 24.05.2009 12d 21h 38m
Total 58d 15h 03m
