(covers information from several alternate timelines)
Gene Roddenberry (also known as G. Roddenberry) was a Starfleet officer in the 23rd and 24th centuries. He was a flag officer with the rank of admiral in 2363.
In 2293, he was listed as a Starfleet Command officer on the dedication plaque of the USS Enterprise-B. (Star Trek Generations, dedication plaque)
In 2353, he was listed as a Starfleet Operational Support Services officer on a directory placard for Starbase 32, Maxia sector. His office was located in room #15850. (TNG: "Violations", directory)
In 2357, William T. Riker was awarded the degree of Master of Science from Starfleet Academy. Roddenberry's signature was on the graduation diploma. (TNG: "Conundrum")
In the 2360s and 2370s, he held the title of Chief of Staff, Starfleet Command, San Francisco. He was listed on the dedication plaques of several Federation starships. (TNG: "Encounter at Farpoint", "Silicon Avatar" dedication plaques; TNG: "The Wounded", dedication plaque; TNG: "Redemption II", dedication plaque; DS9: "Second Sight" dedication plaque; DS9: "The Die is Cast", dedication plaque; VOY: "Caretaker", dedication plaque; Star Trek: First Contact, dedication plaque; VOY: "Message in a Bottle", dedication plaque; DS9: "Valiant", dedication plaque; DS9: "The Dogs of War", dedication plaque)
- (2360s) USS Prometheus
- (2363) USS Phoenix
- (2363) USS Enterprise-D
- (2367) USS Sutherland
- (2370) USS Defiant
- (2371) USS Voyager
- (2372) USS Enterprise-E
- (2372) USS Valiant
- (2373) USS Prometheus
- (2375) USS Defiant
On stardate 47302.5, Harry Kim was awarded the Cochrane Medal of Excellence from the Zefram Cochrane Institute for Advanced Theoretical Physics. Roddenberry's signature was on the award. (VOY: "Non Sequitur", set artwork [1])
In the anti-time future, he was listed as a Starfleet Command officer on the dedication plaque of the USS Pasteur. (TNG: "All Good Things...", dedication plaque)