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Alexander Harper Berkeley (born December 16, 1955) is an American actor. He is known for his television roles as Sheriff Thomas McAllister on the crime drama The Mentalist, George Mason on the political thriller series 24, Percy Rose on the action thriller series Nikita, the Man on The Booth At The End and Gregory in AMC's The Walking Dead. His notable film roles include Todd Voight in Terminator 2: Judgment Day, Agent Gibbs in Air Force One, Bowery Snax in Sid and Nancy, Dr. Lamar in Gattaca, Trevor Lyle in Candyman and Ralph in Heat.
Xander Berkeley is an American character actor recognized for his prolific career appearing in numerous blockbuster film productions and television dramas.
He is known for playing pivotal roles such as George Mason in the political thriller series 24, Gregory in The Walking Dead, and Dr. Lamar in the science fiction film Gattaca.
He is well recognized for his television performances in the series 24, The Walking Dead, Nikita, and The Mentalist.