Xander Berkeley

Berkeley was born in Brooklyn and raised in New Jersey. He is of English and Scottish descent. He attended Hampshire College, and worked in theaters at the Five Colleges, including Smith, Mount Holyoke, Amherst and the University of Massachusetts. He worked in regional and repertory theaters in addition to Off-Broadway in New York City. A casting agent spotted Berkeley in a play written by Reynolds Price called Early Dark and encouraged him to move to Hollywood.Berkeley began playing roles in 1981, with early appearances in M*A*S*H, Cagney & Lacey, Remington Steele, Miami Vice, Moonlighting, and The A-Team. His later television roles included The X-Files, CSI: Crime Scene Investigation, ER and Law & Order.

On screen, his first film role was as the adult version of Christopher Crawford, Christina Crawford's brother, in Mommie Dearest. He has appeared in North Country, Terminator 2: Judgment Day, Phoenix, Kick-Ass, A Few Good Men, The Rookie, Candyman, Apollo 13, Leaving Las Vegas, Gattaca, The Rock, Air Force One, Sid and Nancy, Amistad, Shanghai Noon, Barb Wire and Timecode. He appeared in the television film L.A. Takedown in 1989 and its 1995 acclaimed theatrical remake Heat, directed by Michael Mann. Several of his earlier roles were in films directed by Alex Cox.

In 2001, Berkeley became a recurring guest star (and later a series regular) on 24 in the role of George Mason, the head of the counter-terrorist unit. He portrayed the mysterious John Smith on the CBS drama Jericho.

In 2010, he received one of his best-known roles, Percy Rose on The CW action-thriller series Nikita. He portrayed the character as a series regular and de facto main antagonist of its first two seasons. He also played Sheriff Thomas McAllister on The Mentalist.

Berkeley portrayed Gregory on AMC's The Walking Dead as a guest star in season six and a series regular in seasons seven and eight, with one additional appearance in the season nine premiere.

In 2018, he portrayed Peter Lockwood, the father of Sam Lockwood on the fourth season of Supergirl.

In 2023, he made a guest appearance as Captain Pellaeon in the third season of The Mandalorian, a role he reprised a year later for the animated Tales of the Empire.