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Jack Clemons is an aerospace engineer, air and space industry professional, and author. He was a lead engineer on NASA's Apollo and Space Shuttle Programs, and later an aerospace company executive. He appeared as himself in both the "Command Module" episode of the 2008 Discovery Science Channel six-part documentary Moon Machines. ,and in the 2019 National Geographic Channel two-part documentary Apollo: Back To The Moon. .

Career
Jack got his Bachelor's and Master's Degrees in Aerospace Engineering from the University of Florida. During the Apollo Moon Program he was a lead engineer at TRW Systems Group in Houston, Texas, supporting operations at NASA's Manned Spacecraft Center (now the Johnson Space Center). He developed procedures allowing astronauts to monitor the Apollo Command Module Onboard Guidance and Navigation Computer during atmospheric reentry, and to control the reentry manually should they need to override the computer. He provided real-time reentry support during missions Apollo 9 through Apollo 14, including NASA Mission Control Center backroom support during the extended 6-minute reentry blackout period on Apollo 13.

Following Apollo, at IBM Federal Systems in Houston, he was the overall program manager for the development of the onboard software for NASA's Space Shuttle. Driven by a NASA requirement for "error-free" code, Shuttle Flight Software became the first program rated at CMM Level 5, the highest rating of the Software Engineering Institute's Capability Maturity Model. As a member of the IBM team, Jack worked early on with Shuttle astronauts to design the onboard computer displays, and later provided problem analysis and flight support during the first six Space Shuttle missions.

In the 1990's and 2000's, Jack was Senior Vice President of Engineering at Lockheed Martin Air Traffic Control Company in Rockville, Maryland. His organization designed and implemented the hardware and software required to support the modernization of the FAA's nationwide Air Traffic Control computer systems, and the United Kingdom's London Area Air Traffic Control Centre, as well as systems in Scotland, Eastern Europe, South America, and New Zealand.

As Author
In 2018, Jack published a memoir of his time working on the Apollo and Space Shuttle programs.

He has also published several works of fiction. His stories have appeared in national magazines, fiction anthologies,  and small press publications.