Flew as a test pilot from 1957 to 1960 where he worked in the F-8U Crusader, F-11F Tiger, North American FJ Fury, and A-4D Skyhawk.
Set a transcontinental speed record of 869.74 mph in 2 hours, 47 minutes in the F4H- 1 Phantom II.
Selected to be apart of NASA’s third class of astronauts.
Set an altitude record of 851 miles on his first space flight as pilot of Gemini 11 with Pete Conrad which is still the highest-apogee earth orbit.
Flew on Apollo 12 as Command Module Pilot. However, the mission quickly faced catastrophe as the spacecraft suffered a loss of cockpit displays due to lightning strikes. Regardless, Gordon and the rest of the crew successfully completed the second manned mission to land on the moon.
Served as Chief of Advanced Programs in the Astronaut Office working on the design and application of the space shuttle.