About
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.
Known for
Law & OrderSeries • 1990
The MentalistSeries • 2008
Criminal MindsSeries • 2005
CSI: Crime Scene InvestigationSeries • 2000
BonesSeries • 2005
The X-FilesSeries • 1993
24Series • 2001
Law & Order: Criminal IntentSeries • 2001
The Walking DeadSeries • 2010
The West WingSeries • 1999
ERSeries • 1994
M*A*S*HSeries • 1972
The CloserSeries • 2005
MediumSeries • 2005
FBI: Most WantedSeries • 2020
SupergirlSeries • 2015
Boston LegalSeries • 2004
Falcon CrestSeries • 1981
Remington SteeleSeries • 1982
Miami ViceSeries • 1984
The A-TeamSeries • 1983
The MandalorianSeries • 2019
BullSeries • 2016
MacGyverSeries • 2016