Jack Clemons (November 9, 1943 – May 29, 2024)[1] was an aerospace engineer and air and space industry professional. He was a lead engineer on NASA's Apollo and Space Shuttle Programs, and later an aerospace company executive. He appeared as himself in the "Command Module" episode of the 2008 Discovery Science Channel six-part documentary Moon Machines.[2] He also appeared as himself in the 2019 National Geographic Channel documentary Apollo: Back To The Moon.[3] Following retirement from the aerospace industry, Clemons was a consultant and a professional writer as well as a speaker and presenter on NASA's space programs.