David Livingston was a Starfleet officer in the 24th century.
In 2371, he was a crewmember aboard the USS Voyager. He was among the crew stranded in the Delta Quadrant, when Voyager was forcefully brought there by the Caretaker. In that year, his name was listed on a crew manifest. (VOY: "Projections", crew manifest)
In 2374, as a lieutenant commander, he was listed on another crew manifest. (VOY: "The Killing Game", crew manifest)
This character was only mentioned in writing.