Xander Berkeley
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
Terminator 2: Judgment Day 
Taken 
Kick-Ass 
Gattaca 
Transcendence 
Apollo 13 
A Few Good Men 
Fracture 
Air Force One 
Shanghai Noon 
Faster 
Year One 
Solace 
Candyman 
The Dark and the Wicked 
Seeking Justice 
North Country 
Sid and Nancy 
City of Lies 
Seraphim Falls 
Son of Batman 
Barb Wire 
Universal Soldier: The Return 
The Rookie 
The Fabulous Baker Boys 
Internal Affairs 
Reagan 
Superman/Batman: Public Enemies 
Proud Mary 
Mommie Dearest 
Storytelling 
Safe 
Volunteers 
Rust 
Butcher's Crossing 
Timecode 
The Guardian 
Poison Ivy II 
Girl Walks Into a Bar 
In Enemy Hands 
The Man from Elysian Fields 
Phoenix 
Drop Dead Sexy 
Straight to Hell 
Roswell 
Short Time 
The Gun in Betty Lou's Handbag 
Small Time 
Louder Than Words 
Donato and Daughter 
Deadly Dreams 
Shot 
Omega Syndrome 
The Wall of Mexico 
The Maestro 
Born Guilty 
Heightened 
Alchemy of the Spirit