Tom Corbin was a scientist stationed aboard the USS Enterprise-D during the late 2360s. Corbin was assigned to the science lab, where he occasionally worked with Keiko O'Brien.
In 2367, Miles O'Brien was among those Enterprise crew members suffering from a lack of REM sleep due to an alien telepathic transmission. When Keiko came home late one night from the science lab, he asked if Corbin was there. Before she could answer the question, he became extremely jealous, accusing her of using "any excuse to pay him a visit." (TNG: "Night Terrors")
This character was only mentioned in dialogue.