Tom Moore was a Starfleet officer in the 24th century.
In 2353, he was listed as a Starfleet Operational Support Services officer on a directory placard in Starbase 32, Maxia sector. His office was located in room #65114. (TNG: "Violations", directory)
In 2371, Lieutenant Tom Moore 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)
A year later, he was listed as a lieutenant on the Planetary Geosciences Division duty roster. (VOY: "Parturition")