John Nesterowicz was a Starfleet officer who lived during in the mid-24th century.
In 2367, as a lieutenant aboard the USS Enterprise, he was a WarpField Tech 2 for the Third Shift Antimatter Operations Unit. He was listed as being on duty in the Engineering Division Duty Roster. This roster was on display via the desktop monitor in the ready room. (TNG: "Suddenly Human", okudagram)
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 2372, as a lieutenant, he was listed on the Planetary Geosciences Division duty roster. (VOY: "Parturition")
In 2374, he was listed as an ensign on a crew manifest. (VOY: "The Killing Game" okudagram)
This character was only mentioned in writing.