Professor Steve Gallaci was a Human Starfleet officer of the 24th century.
In 2364, he was named in a list of Starfleet personnel that were scheduled for transfer from the USS Robert Louis Stevenson to the USS Discovery on stardate 41044.2. (TNG: "Conspiracy", okudagram)
Steve Gallacci might have been named after the comic writer Steve Gallaci. One of his creations, Erma Felna, would have her name appear on a mission order as a Starfleet admiral.