![John Grunsfeld wearing an astronaut suit and holding his helmet.](https://science.nasa.gov/wp-content/uploads/2023/04/johngrunsfeld-profile-jpg.webp?w=4096&format=png)
John Grunsfeld
Astronaut, Astronomer and Former Associate Administrator for the Science Mission Directorate Dr. John Grunsfeld
Credits: NASA's Goddard Space Flight Center/Bill Hrybyk
Image CreditNASA's Goddard Space Flight Center/Bill Hrybyk
Size480x680px