Marvin Rush was a member of Starfleet in the 24th century.

As an admiral, he was listed as Starfleet Exploratory Division personnel on the dedication plaque of the starship USS Brattain in 2345. (TNG: "Night Terrors")

In 2353, Rush was listed on a directory placard as having an office in room 55154 on Starbase 32. (TNG: "Violations")

On stardate 40250.5, with the title of captain, Rush was listed as representing Starfleet Stellar Imaging on the dedication plaque of the starship USS Phoenix. (TNG: "The Wounded")

On stardate 44820.5, Captain Rush was listed as Stellar Imaging personnel on the dedication plaque of the starship USS Sutherland. (TNG: "Redemption II")

He was part of the Starfleet Research and Development group which helped design and construct the USS Voyager. His name was listed on the dedication plaque of that vessel when it was commissioned in 2371. (Star Trek: Voyager set artwork)