An Astronaut Explores NASA’s Scientific Frontiers

He’s flown the space shuttle five times, and performed eight spacewalks to service the Hubble telescope. Now astronaut and astrophysicist John Grunsfeld heads up NASA’s Science Mission Directorate, where he manages scientific investigations on the home planet — and beyond.

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John Grunsfeld

John Grunsfeld is an astrophysicist, astronaut, and associate administrator at NASA’s Science Mission Directorate in Washington, D.C.