Jim Unsinn was a 24th century member of Starfleet.

Unsinn was listed on the dedication plaque of the starship USS Defiant (NX-74205) on stardate 47538.5, in the group of names of representatives from Starfleet Research and Development. (Star Trek: Deep Space Nine set artwork)

In 2375, Unsinn was credited on a plaque as part of the R&D crew of newly constructed USS São Paulo. (DS9: "The Dogs of War" set artwork)