He served in the administration, helm or engineering departments and had an AB– blood type. His best friend Lieutenant Alain Reynolds once described him as being full of life, never being scared, and living a charmed life, expecting to retire and have children after 20 years of service.
In 2285, Thometz brought a tricorder along on a landing party survey of an unnamed class M planet in the 12 Lyncis system, accompanied by Reynolds, Brickner, and Lia Burke. During the mission, a huge, bearlike carnivore leapt at Thometz, smashing him into a tree and gashing his chest from abdomen to left shoulder, and he died nearly immediately.
- His rank was unstated and not visible on his uniform. He may be related to Starfleet Academy Commandant Greg Thometz.