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
(Secret Service 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)
The Garage
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
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
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)
The Truth About Juliet
(George)
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
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
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)
North Country
(Arlen Pavich)
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)
Medium
(Mitchell Slocombe)
Nash Bridges
(Neil Wojak)
Falcon Crest
(Buzz Whitehead)
Duckman
Batman Beyond
(Dr. Childes (voice))
Law & Order
(Clay Pollack)
M*A*S*H
(Marine)
Remington Steele
(Dan Kowalski)
Jericho
(John Smith (uncredited))
Teen Titans
(Mento / General Immortus (voice))
CSI: Crime Scene Investigation
(Rory Atwater)
The Incredible Hulk
The Adventures of Brisco County, Jr.
(Brett Bones)
Karen Sisco
The A-Team
(Baker)
The Batman
(Paul (voice))
Miami Vice
Gargoyles
Bones
(Dr. Bancroft)
The Twilight Zone
The Wild Thornberrys
(Barking Deer #2 (voice))
Moonlighting
(Scalper)
Tales of the Gold Monkey
New York Undercover
Criminal Minds
(Det. Hyde)
The X-Files
(Dr. Hodge)
Hart to Hart
Cagney & Lacey
Superman: The Animated Series
(Sgt. Corey Mills (voice))
Law & Order: Criminal Intent
(George Pagolis)
Wiseguy
ER
(Detective Wilson)
Boston Legal
(A.D.A. Rex Swarthmore)
Partners
The Court
Day One
The Outer Limits
(Terry McCammon)
Truth Be Told
(Lee Hackman)
The Mandalorian
(Gilad Pellaeon)
Zoo
(Ronnie 'Dogstick' Brannigan)
Nikita
(Percy Rose)
The Twilight Zone
(Harry Kellogg)
Justice League
(General Brak / Dignitary / Soldier (voice))
Justice League
(General Brak / Soldier (voice))
The Wild Thornberrys
(Stoat (voice))
The Mentalist
(Sheriff Thomas McAllister)
Salem
(Magistrat Hale)
Jericho
(John Smith (voice))
The West Wing
(Franklin Hollis)
Ben 10: Ultimate Alien
(Warden Morgg / Trukk (voice))
The Walking Dead
(Gregory)
Bull
(Judge Hollingsworth)
Life with Louie
12 Monkeys
(Jonathan Foster)
Netforce
(Bo Tyler)
Being Human
(Liam McClean)
Being Human
(Liam McLean)
The Tick
(Octopaganini (voice))
The Legend of Calamity Jane
(Additional Voices (voice))
Justified
(Charles Monroe)
Women: Stories of Passion
(Jimbo)
Extreme Ghostbusters
100 Scariest Movie Moments
(Self)
The A-Team
(Sergeant Wilson)
Supergirl
(Peter Lockwood)
Dead Talk Live
(Self - Guest)
Wolf Lake
(Carl)
Star Wars: Tales of the Empire
(Gilad Pellaeon (voice))
MacGyver
(General John Acosta)
Going to California
(Clay Shelton)
Longmire
(Jeremiah Rains)
The Booth at the End
(The Man)
Super Force
Good Advice
(Bernard)
The Closer
(Detective Curt Landry)
Teen Titans
(Warp (voice))
24
(George Mason)
FBI: Most Wanted
(Maurice Hewitt)
Grand
(Jeffrey)
Batman: The Brave and the Bold
(Sinestro (voice))
Beware the Batman
(Manhunter / Paul Kirk (voice))