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.
Terminator 2: Judgment Day
Todd Voight
A Few Good Men
Capt. Whitaker
Heat
Ralph
Apollo 13
Henry Hurt
Gattaca
Dr. Lamar
Universal Soldier: The Return
Dr. Dylan Cotner
The Fabulous Baker Boys
Lloyd
Superman/Batman: Public Enemies
Captain Atom (voice)
Fracture
Judge Moran
The Rookie
Blackwell
Kick-Ass
Detective Gigante
In Enemy Hands
Admiral Kentz
Short Time
Stark
Barb Wire
Alexander Willis
Shanghai Noon
Nathan Van Cleef
Taken
Stuart St. John
Candyman
Trevor Lyle
Safe
Greg
Air Force One
Agent Gibbs
L.A. Takedown
Waingro
Seraphim Falls
Railroad Foreman
Straight to Hell
Preacher McMahon
Deepwater
Gus
Phoenix
Lt. Clyde Webber
Walker
Byron Cole
If These Walls Could Talk
John Barrows
Timecode
Evan Wantz
Sid and Nancy
Bowery Snax
Pony
Uncle Jeff
Mommie Dearest
Christopher Crawford
Bedrooms
Harry
Storytelling
Mr. DeMarco
Luster
Detective Carter
Year One
King
Quicksand
Joey Patterson
The Grifters
Lt. Pierson
Poison Ivy 2: Lily
Donald Falk
Magma: Volcanic Disaster
Peter Shepherd
Volunteers
Kent Sutcliffe
Persons Unknown
Tosh
NetForce
Bo Tyler
Seeking Justice
Lieutenant Durgan
Cook County
Sonny
Attack of the 50 Ft. Woman
Second Man
Deadly Dreams
Jack Torme
China: The Panda Adventure
Dakar Johnston
Heightened
Gordon
Girl Walks Into a Bar
Moe
Omega Syndrome
Yo-Yo
Below the Beltway
McMahon
Alchemy of the Spirit
Oliver
The Toe Tactic
Dad
Donato and Daughter
Russ Loring
That Guy... Who Was in That Thing
Self
The Verne Miller Story
Cardogan
The Lawless Land
Ez Andy
Winchell
Gavreau
Son of Batman
Dr. Kirk Langstrom (voice)
Live at the Foxes Den
Kenneth
It's Nothing Personal
James Blakemore
Louder Than Words
Dr. Lansen
Small Time
Chick
Dillinger
Harry Copeland
Drop Dead Sexy
Harkness
The Gumshoe Kid
Monty Griswold
The Guardian
Detective
Butcher's Crossing
Charlie Hoge
Transcendence
Dr. Thomas Casey
Breast Men
Male Interviewer
The Keys
Harold
Tales of Everyday Magic
Peter Keller
A Private Matter
Peter Zenner
No Address
Harris
The Audition
Joel
Murder in High Places
Wayne
Within the Rock
Ryan
Solace
Mr. Ellis
Out There
Uncle Doug
Deadly Matrimony
Kozolowski
Moments of Clarity
Artemis
The Ghost Trap
Maynard
Apollo 11: First Steps on the Moon
Buzz Aldrin
The Third Date
Tommy Tulip
The Rock
Lonner (uncredited)
This Last Lonely Place
Frank Devore
Roswell
Sherman Carson
Allegiant
Phillip
Americans with No Address
Self
Inside the Box
Fred O'Brien
Five
Peter
Caroline at Midnight
Joey Szabo
Repo Chick
Father De La Chasse
Tag: The Assassination Game
Connally
Not of This World
Bruce MacNamara
Standing Still
Jonathan
Proud Mary
Uncle
Shot
Dr. Roberts
A Kidnapping in the Family
Curtis Harrison
Born Guilty
Mr. Milk
The Gift
Forrest Bobo
City of Lies
Edwards
Leaving Las Vegas
Cynical Cabbie
Amistad
Hammond
The Cherry Orchard
Yepihodov
The Wall of Mexico
Michael Rand
The Maestro
Mario Castelnuovo-Tedesco
The Killing Jar
Danny “Figaretto” Evans
The Fifteen Minute Hamlet
Shakespeare
Faster
Sergeant Mallory
A Family Thing
Sunburned Man
Bulletproof
Gentry
Sparks
Sid Harris
Billy Bathgate
Harvey Preston
The Assassin
John Patrick Earl
The Gun in Betty Lou's Handbag
Marchat
Tapeheads
Ricky Fell
The Last of the Finest
Fast Eddie
Internal Affairs
Rudy Mohr
Driven
J.D. Johnson
The Dark and the Wicked
Priest
Women in Trouble
Mr. Frost
Dark Harbor
Priest James
Fire on the Mountain
The Man from Elysian Fields
Virgil Koster
For Hope
Date #4 (uncredited)
For the Boys
Roberts, Vietnam
Reagan
George Schultz
The Last Full Measure
North Country
Arlen Pavich
Rust
Blackburn
One Night Stand
Charlie's Friend
Schindler Space Architect
Frank Lloyd Wright (voice)
Legacy of Screams: The Evolution of Horror Movies
Self - (archive footage)
Relapse
Seymour