https://aviationweek.com/astronaut-scientist-john-grunsfeld-retiring-nasa
Astronaut-Scientist John Grunsfeld Retiring From NASA | Aviation Week Network
John Grunsfeld, a five-time space shuttle astronaut who specialized in hands-on upgrades to the Hubble Space Telescope, will retire from NASA at the end of the...
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https://science.nasa.gov/image-detail/27411554913-a7e9b7170f-o/
Astronaut John M. Grunsfeld - NASA Science
Astronaut John M. Grunsfeld, STS-109 payload commander, participates in the third of five spacewalks to perform work on the Hubble Space Telescope (HST). The...
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https://fas.org/expert/john-grunsfeld/
John Grunsfeld - Federation of American Scientists
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