Jim Unsinn was a Starfleet officer in the 24th century.
In the 2370s, he was named as a member of the Research and Development team responsible for the creation of the Defiant-class starships USS Defiant, in 2370, and USS Sao Paulo, in 2375. (DS9: "The Die is Cast", dedication plaque; DS9: "The Dogs of War", dedication plaque)
This character was only mentioned in writing.
Unsinn was named for production staff associate Jim Unsinn.
He was listed as a member of Science Ops at Utopia Planitia Fleet Yards on the dedication plaque of the USS Odyssey. This plaque was made for the Star Trek: Deep Space Nine episode "The Jem'Hadar", but did not make an appearance in the episode. The plaque can be viewed at the Twitter account of DS9's writer and producer Ira Steven Behr. [1]