Seth Gilliam
Biography
Seth Gilliam (November 5, 1968) is an American screen and stage actor. He is most known as Father Gabriel on AMC's post-apocalyptic series The Walking Dead, first appearing in Season 5. He is also known for his HBO television roles, first as corrections officer-turned-prisoner Clayton Hughes on Oz, and later as Baltimore police detective promoted to Sergeant, Ellis Carver on The Wire. On both of these series, he co-starred with Lance Reddick and J.D. Williams. Another of his major recurring roles was on the TV series Teen Wolf as Dr. Alan Deaton. He had a recurring role during the seventh season of The Cosby Show as Aaron Dexter (boyfriend of Erika Alexander's character Pam), Law and Order: Criminal Intent, and Law and Order: Trial by Jury. He's had a number of guest roles in other shows such as CSI: Miami, Nurse Jackie, Skins, Person of Interest, The Good Wife, and Bull. His feature film credits include his role as Sergeant Steven Altameyer in Courage Under Fire (1996) and Private Sugar Watkins in the action movie Starship Troopers (1997). His other films include Personal Velocity (2002), Did You Hear About the Morgans? (2009), and Still Alice (2014).
Known For

The Blacklist

Law & Order

Law & Order

Criminal Minds

The Walking Dead

Homeland

CSI: Miami

Person of Interest
All Movies (30)
- Ride or Die2025 · as Creon
- The Lady of the Lake2024 · as Adam Schultz
- The Zombie Wedding2023 · as Reverend Harry Crump
- Teen Wolf: The Movie2023 · as Dr. Alan Deaton
- The Walking Dead: One More2021 · as Gabriel Stokes
- Silver Lake2018 · as Jeff
- Change in the Air2018 · as Officer Payne
- Police State2018 · as Officer Grady
- Still Alice2014 · as Frederic Johnson
- The Skinny2012 · as Testing Van Doc
- Betrayed2010 · as Roger Waite
- Did You Hear About the Morgans?2009 · as U.S. Marshal Lasky
- The People v. Leo Frank2009 · as Jim Conley
- Sympathetic Details2008 · as Raymond
- The Wire: The Last Word2007 · as Self
- The Wire Odyssey2007 · as Self
- Tapping the Wire2007 · as Self
- The Great New Wonderful2005 · as Clayton
- Personal Velocity2002 · as Vincent
- Punks2000 · as Marcus
- Starship Troopers1997 · as Private Sugar Watkins
- Tar1996 · as Tyrone
- Courage Under Fire1996 · as Stephen Altameyer
- Heading Home1995 · as Willie
- Jefferson in Paris1995 · as James Hemings
- Assault at West Point: The Court-Martial of Johnson Whittaker1994 · as Cadet Johnson C. Whittaker
- Mr. Wonderful1993 · as Emergency Room Doctor (unconfirmed)
- Joey Breaker1993 · as Jeremy Brasher
- In the Eyes of a Stranger1992
- Stakeout (Short)—
All TV Shows (22)
- Suits LA2025 · as Dean Harris
- The Walking Dead: The Ones Who Live2024 · as Gabriel Stokes
- City on a Hill2019 · as Jasper Fields
- Bull2016 · as Dr. Poulson
- The Blacklist2013 · as Larry Whitaker
- Elementary2012 · as Dr. Ira Wallace
- Homeland2011 · as Chaplin
- Person of Interest2011 · as Des Franklin
- Teen Wolf2011 · as Alan Deaton
- The Walking Dead2010 · as Gabriel Stokes
- The Good Wife2009 · as Jacob Rickter
- Nurse Jackie2009 · as Dr. Lindsey
- Damages2007 · as Mark Waters
- Criminal Minds2005 · as Lyle Johnson
- Law & Order: Trial by Jury2005 · as Terence Wright
- CSI: Miami2002 · as Aaron Nolan
- The Wire2002 · as Ellis Carver
- Law & Order: Criminal Intent2001 · as Detective Daniels
- Oz1997 · as Clayton Hughes
- Law & Order1990 · as Michael´s Attorney
- Law & Order1990 · as Babatunde Amoda
- The Cosby Show1984 · as Aaron Dexter