Movies

Alexander Harper Berkeley (born December 16, 1955) is an American actor. Since beginning his career in the early 1980s, he has appeared in over 200 film and television projects. His films include Terminator 2: Judgment Day (1991), Candyman (1992), Barb Wire (1996), Air Force One (1997), Gattaca (1997), and Shanghai Noon (2000). He also appeared in the crime drama Heat (1995) after being cast in L.A. Takedown (1989), an earlier rendition of the film's script, although he played two different characters on the two different films. On television, he headlined the Citytv psychological thriller The Booth at the End (2010–2012) and was a series regular on the Fox action drama 24 (2001–03) and The CW action thriller Nikita (2010–2012). As a guest star, Berkeley portrayed Sheriff Thomas McAllister on the CBS drama The Mentalist (2008–13) and Gregory on the AMC post-apocalyptic horror The Walking Dead (2016–18).

Early life and education
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.