David Livingston was a Starfleet officer in the 24th century.

In the late 2360s, he was a captain at Starfleet Academy. He was assigned as a wing commander for the Third Academy Training Wing. His name, rank, and title were on a Flight Proficiency Award for Harry Kim. (VOY: "Non Sequitur", set artwork)

This character was only mentioned in writing.
The document was presented for auction as a part of the set "Harry Kim Office and Apartment Set Dressing Lot" in the It's A Wrap! sale and auction. [1]