Seth Gilliam is an American actor. His acting career started in the early 1990s. His television debut was in The Cosby Show. During this period, he also appeared in the films Joey Breaker, Courage Under Fire, and Starship Troopers. He later starred as Clayton Hughes in the TV series Oz. In the 2000s, he became known for his role as Ellis Carver in the acclaimed show The Wire. He also appeared as Detective Daniels in Law & Order: Criminal Intent. In the 2010s, he played the role of Dr. Alan Deaton in Teen Wolf. He became further known for his role as Gabriel Stokes in The Walking Dead.