Joe Longo 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 #75274. (TNG: "Violations", directory)
According to the dedication plaques of various Federation starships, Longo was listed as a yard engineer during the construction of the USS Defiant at Antares Ship Yards in 2370, the USS Valiant at the same shipyards in 2372, and the USS Sao Paulo at Utopia Planitia Ship Yards in 2375. (DS9: "The Die is Cast", dedication plaque; DS9: "Valiant", dedication plaque; DS9: "The Dogs of War", dedication plaque)
This character was only mentioned in writing.
He was named after property master Joe Longo.