Joe Longo was a Human 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 the 2370s, he was listed as an Yard Engineer on the dedication plaque of Defiant-class starships. (DS9: "Defiant", dedication plaque; DS9: "Valiant", dedication plaque, DS9: "The Dogs of War", dedication plaque)
He was named after property master Joe Longo.