AT: "xx" Dick D'Angelo was a Starfleet officer in the 24th century.
In 2354, 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 #75274. (TNG: "Violations", directory)
In 2367, he was a lieutenant aboard the USS Enterprise-D. According to the Engineering Division duty roster, he was an Ops Engineer for the Third Shift Antimatter Operations Unit. This roster was on display via the desktop monitor in the ready room. (TNG: "Suddenly Human", okudagram)
In 2371, he was listed as a crewmember aboard the USS Voyager in a crew manifest. (VOY: "Projections", crew manifest)
In 2372, he was listed on the Planetary Geosciences Division duty roster. (VOY: "Parturition")
In an unknown, alternate future timeframe, he was listed as a Tactical Systems officer on the dedication plaque of the USS Pasteur. (TNG: "All Good Things..." dedication plaque)