Thomas J. Kelly graduated from Cornell University in 1951, where he was a member of the Quill and Dagger society.
Kelly was the Project Engineer, Engineering Manager and Deputy Program Manager for Grumman Aircraft's Apollo Lunar Module (1962–1970). His book Moon Lander documents the process of designing, building and flying the Lunar Module.
Kelly was portrayed by Matt Craven in the 1998 miniseries From the Earth to the Moon.