
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.

Todd Voight
Terminator 2: Judgment Day

Capt. Whitaker
A Few Good Men

Ralph
Heat

Henry Hurt
Apollo 13

Dr. Lamar
Gattaca

Dr. Dylan Cotner
Universal Soldier: The Return

Lloyd
The Fabulous Baker Boys

Captain Atom (voice)
Superman/Batman: Public Enemies

Judge Moran
Fracture

Blackwell
The Rookie

Detective Gigante
Kick-Ass

Admiral Kentz
In Enemy Hands

Stark
Short Time

Alexander Willis
Barb Wire

Nathan Van Cleef
Shanghai Noon

Stuart St. John
Taken

Trevor Lyle
Candyman

Greg
Safe

Agent Gibbs
Air Force One

Waingro
L.A. Takedown

Railroad Foreman
Seraphim Falls

Preacher McMahon
Straight to Hell

Gus
Deepwater

Lt. Clyde Webber
Phoenix

Byron Cole
Walker

John Barrows
If These Walls Could Talk

Evan Wantz
Timecode

Bowery Snax
Sid and Nancy

Uncle Jeff
Pony

Christopher Crawford
Mommie Dearest

Harry
Bedrooms

Mr. DeMarco
Storytelling

Detective Carter
Luster

King
Year One

Joey Patterson
Quicksand

Lt. Pierson
The Grifters

Donald Falk
Poison Ivy 2: Lily

Peter Shepherd
Magma: Volcanic Disaster

Doc Ruppert
The Garage

Kent Sutcliffe
Volunteers

Tosh
Persons Unknown

Bo Tyler
NetForce

Lieutenant Durgan
Seeking Justice

Sonny
Cook County

Second Man
Attack of the 50 Ft. Woman

Jack Torme
Deadly Dreams

Dakar Johnston
China: The Panda Adventure

Gordon
Heightened

Moe
Girl Walks Into a Bar

Yo-Yo
Omega Syndrome

McMahon
Below the Beltway

Oliver
Alchemy of the Spirit

Dad
The Toe Tactic

Russ Loring
Donato and Daughter

Self
That Guy... Who Was in That Thing

Cardogan
The Verne Miller Story

Ez Andy
The Lawless Land

Gavreau
Winchell

Dr. Kirk Langstrom (voice)
Son of Batman

Kenneth
Live at the Foxes Den

James Blakemore
It's Nothing Personal

Dr. Lansen
Louder Than Words

Chick
Small Time

Harry Copeland
Dillinger

Harkness
Drop Dead Sexy

Monty Griswold
The Gumshoe Kid

Detective
The Guardian

Charlie Hoge
Butcher's Crossing

Dr. Thomas Casey
Transcendence

Male Interviewer
Breast Men

Harold
The Keys

Peter Keller
Tales of Everyday Magic

Peter Zenner
A Private Matter

Harris
No Address

Joel
The Audition

Wayne
Murder in High Places

Ryan
Within the Rock

Mr. Ellis
Solace

Uncle Doug
Out There

Kozolowski
Deadly Matrimony

Artemis
Moments of Clarity

Maynard
The Ghost Trap

Buzz Aldrin
Apollo 11: First Steps on the Moon

Tommy Tulip
The Third Date

Lonner (uncredited)
The Rock

Frank Devore
This Last Lonely Place

Sherman Carson
Roswell

Phillip
Allegiant

George
The Truth About Juliet

Self
Americans with No Address

Fred O'Brien
Inside the Box

Peter
Five

Joey Szabo
Caroline at Midnight

Father De La Chasse
Repo Chick

Connally
Tag: The Assassination Game

Bruce MacNamara
Not of This World

Jonathan
Standing Still

Uncle
Proud Mary

Dr. Roberts
Shot

Curtis Harrison
A Kidnapping in the Family

Mr. Milk
Born Guilty

Forrest Bobo
The Gift

Edwards
City of Lies

Cynical Cabbie
Leaving Las Vegas

Hammond
Amistad

Yepihodov
The Cherry Orchard

Michael Rand
The Wall of Mexico

Mario Castelnuovo-Tedesco
The Maestro

Danny “Figaretto” Evans
The Killing Jar

Shakespeare
The Fifteen Minute Hamlet

Sergeant Mallory
Faster

Sunburned Man
A Family Thing

Gentry
Bulletproof

Sid Harris
Sparks

Harvey Preston
Billy Bathgate

John Patrick Earl
The Assassin

Marchat
The Gun in Betty Lou's Handbag

Ricky Fell
Tapeheads

Fast Eddie
The Last of the Finest

Rudy Mohr
Internal Affairs

J.D. Johnson
Driven

Priest
The Dark and the Wicked

Mr. Frost
Women in Trouble

Priest James
Dark Harbor

Fire on the Mountain

Virgil Koster
The Man from Elysian Fields

Date #4 (uncredited)
For Hope

Roberts, Vietnam
For the Boys

George Schultz
Reagan

The Last Full Measure

Arlen Pavich
North Country

Blackburn
Rust

Oddities

Recluse

Charlie's Friend
One Night Stand

Frank Lloyd Wright (voice)
Schindler Space Architect

Paradise: Disturbed

Self - (archive footage)
Legacy of Screams: The Evolution of Horror Movies

Seymour
Relapse
Known For
Acting
Known Credits
139
Gender
Male
Birthday
1955-12-16
Place of Birth
Brooklyn, New York City, New York, USA
Also Known As
Alexander Harper Berkeley