|John Mace Grunsfeld received a B.S. degree in physics from M.I.T. ; an M.S. degree and Ph.D. in physics from the University of Chicago. Dr. Grunsfeld studies binary pulsars and energetic x-ray and gamma ray sources using the NASA Compton Gamma Ray Observatory, x-ray astronomy satellites, radio telescopes, and optical telescopes including the NASA Hubble Space Telescope. He became an astronaut in 1992 and led a team of scientists tasked with defining and producing the crew displays for command and control of the International Space Center (ISS). He has logged over 45 days in space, including 5 space walks. He participated in the second flight of the astro observatory in 1995. He served as flight engineer of a 10 day mission to dock with Russia's Space Station Mir in 1997. He has participated in two servicing missions of the Hubble Telescope in 1999 and 2002.|
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