State University of New York at Purchase
Joined the cast of "The Walking Dead" (AMC, 2010-) as Father Gabriel Stokes
Cast as Sergeant Carver Ellis in "The Wire" (HBO, 2002-08)
Landed his first recurring role as Officer Clayton in "Oz" (HBO, 1997-2003)
Gilliam has appeared on stage as Prince Edward in a 1993 production of "Richard III" and as the lead in the Commonwealth Shakespeare Company's 2010 production of "Othello."