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.

Filmography

• 2026Oddities
• 2026Recluse
• 2026Saving Black Bear — Skip
• 2025No Address — Harris
• 2024Reagan — George Schultz
• 2024Rust — Blackburn
• 2024Schindler Space Architect — Frank Lloyd Wright (voice)
• Star Wars: Tales of the Empire — Gilad Pellaeon (voice)
• 2024The Ghost Trap — Maynard
• 2023Butcher's Crossing — Charlie Hoge
• 2023Heightened — Gordon
• 2022Alchemy of the Spirit — Oliver
• 2022The Audition — Joel
• FBI: Most Wanted — Maurice Hewitt
• 2020The Dark and the Wicked — Priest
• 2020The Wall of Mexico — Michael Rand
• 2019Dark Harbor — Priest James
• The Mandalorian — Gilad Pellaeon
• Truth Be Told — Lee Hackman
• 2018City of Lies — Edwards
• 2018Proud Mary — Uncle
• 2018The Maestro — Mario Castelnuovo-Tedesco
• 2017Born Guilty — Mr. Milk
• 2017Shot — Dr. Roberts
• 2016Allegiant — Phillip
• Bull — Judge Hollingsworth
• MacGyver — General John Acosta
• 2016Moments of Clarity — Artemis
• 12 Monkeys — Jonathan Foster
• 2015Solace — Mr. Ellis
• Supergirl — Peter Lockwood
• 2015The Gift — Forrest Bobo
• Zoo — Ronnie 'Dogstick' Brannigan
• 2014ETXR — Gordon Shafer
• 2014Pony — Uncle Jeff
• 2014Red John
• Salem — Magistrat Hale
• 2014Small Time — Chick
• 2014Son of Batman — Dr. Kirk Langstrom (voice)
• 2014This Last Lonely Place — Frank Devore
• 2014Transcendence — Dr. Thomas Casey
• Beware the Batman — Manhunter / Paul Kirk (voice)
• 2013Live at the Foxes Den — Kenneth
• 2013Louder Than Words — Dr. Lansen
• Longmire — Jeremiah Rains
• 2012Tales of Everyday Magic — Peter Keller
• Being Human — Liam McClean, Liam McLean
• 2011Five — Peter
• 2011Girl Walks Into a Bar — Moe
• 2011Inside — H1ghway_man
• NTSF:SD:SUV:: — Theodore Dent
• 2011Seeking Justice — Lieutenant Durgan
• The Booth at the End — The Man
• 2010Bedrooms — Harry
• 2010Below the Beltway — McMahon
• Ben 10: Ultimate Alien — Warden Morgg / Trukk (voice)
• 2010Faster — Sergeant Mallory
• Justified — Charles Monroe
• 2010Kick-Ass — Detective Gigante
• 2010Luster — Detective Carter
• Nikita — Percy Rose
• The Walking Dead — Gregory
• 2009Cook County — Sonny, Producer
• 2009Inside the Box — Fred O'Brien
• 2009Repo Chick — Father De La Chasse
• 2009Sparks — Sid Harris
• 2009Superman/Batman: Public Enemies — Captain Atom (voice)
• 2009The Toe Tactic — Dad
• 2009Women in Trouble — Mr. Frost
• 2009Year One — King
• Batman: The Brave and the Bold — Sinestro (voice)
• 2008Taken — Stuart St. John
• The Mentalist — Sheriff Thomas McAllister
• 2007Fracture — Judge Moran
• 2007Seraphim Falls — Railroad Foreman
• Jericho — John Smith (uncredited), John Smith (voice)
• 2006Magma: Volcanic Disaster — Peter Shepherd
• 2006Out There — Uncle Doug
• 2006The Garage — Doc Ruppert
• Bones — Dr. Bancroft
• Criminal Minds — Det. Hyde
• 2005Deepwater — Gus
• 2005Drop Dead Sexy — Harkness
• Medium — Mitchell Slocombe
• 2005North Country — Arlen Pavich
• 2005Standing Still — Jonathan
• The Closer — Detective Curt Landry
• Boston Legal — A.D.A. Rex Swarthmore
• 2004In Enemy Hands — Admiral Kentz
• The Batman — Paul (voice)
• 2004The Last Full Measure
• Karen Sisco — Alvin Simmons
• 2003Quicksand — Joey Patterson
• Teen Titans — Mento / General Immortus (voice), Warp (voice)
• 2003The Third Date — Tommy Tulip
• The Court — Keith Nolan
• The Twilight Zone — Harry Kellogg
• 24 — George Mason
• 2001China: The Panda Adventure — Dakar Johnston
• Going to California — Clay Shelton
• Justice League — General Brak / Soldier (voice), General Brak / Dignitary / Soldier (voice)
• Law & Order: Criminal Intent — George Pagolis
• 2001Storytelling — Mr. DeMarco
• 2001The Man from Elysian Fields — Virgil Koster
• CSI: Crime Scene Investigation — Rory Atwater
• 2000Shanghai Noon — Nathan Van Cleef
• 2000Timecode — Evan Wantz
• Batman Beyond — Dr. Childes (voice)
• 1999NetForce — Bo Tyler
• Netforce — Bo Tyler
• 1999The Cherry Orchard — Yepihodov
• The West Wing — Franklin Hollis
• 1999Universal Soldier: The Return — Dr. Dylan Cotner
• 1998Driven — J.D. Johnson
• 1998Phoenix — Lt. Clyde Webber
• 1998The Truth About Juliet — George
• The Wild Thornberrys — Barking Deer #2 (voice), Stoat (voice)
• 1998Winchell — Gavreau
• 1997Air Force One — Agent Gibbs
• 1997Amistad — Hammond
• 1997Breast Men — Male Interviewer (voice)
• Extreme Ghostbusters
• 1997Gattaca — Dr. Lamar
• 1997One Night Stand — Charlie's Friend
• 1997The Killing Jar — Danny “Figaretto” Evans
• The Legend of Calamity Jane — Additional Voices (voice)
• 1996A Family Thing — Sunburned Man
• 1996A Kidnapping in the Family — Curtis Harrison
• 1996Apollo 11: First Steps on the Moon — Buzz Aldrin
• 1996Barb Wire — Alexander Willis
• 1996Bulletproof — Gentry
• 1996For Hope — Date #4 (uncredited)
• 1996If These Walls Could Talk — John Barrows
• Nash Bridges — Neil Wojak
• 1996Persons Unknown — Tosh
• 1996Poison Ivy 2: Lily — Donald Falk
• Superman: The Animated Series — Sgt. Corey Mills (voice)
• 1996The Rock — Lonner (uncredited)
• 1996Within the Rock — Ryan
• Women: Stories of Passion — Jimbo
• 1995Apollo 13 — Henry Hurt
• 1995Heat — Ralph
• 1995Leaving Las Vegas — Cynical Cabbie
• Life with Louie — Pro Shop Cashier (voice)
• Partners — Christophe Nnngaarzh
• 1995Safe — Greg
• 1995The Fifteen Minute Hamlet — Shakespeare
• The Outer Limits — Terry McCammon
• 1994Attack of the 50 Ft. Woman — Second Man
• 1994Caroline at Midnight — Joey Szabo
• Duckman — Hans (voice)
• ER — Detective Wilson
• Gargoyles — Iago (Voice), Coldsteel (Voice)
• New York Undercover — Dr Carl Weschler
• 1994Roswell — Sherman Carson
• The Tick — Octopaganini (voice)
• 1993Donato and Daughter — Russ Loring
• Good Advice — Bernard
• 1993It's Nothing Personal — James Blakemore
• The Adventures of Brisco County, Jr. — Brett Bones
• The X-Files — Dr. Hodge
• 1992A Few Good Men — Capt. Whitaker
• 1992A Private Matter — Peter Zenner
• 1992Candyman — Trevor Lyle
• 1992Deadly Matrimony — Kozolowski
• 1992The Gun in Betty Lou's Handbag — Marchat
• 1992The Keys — Harold
• 1991Billy Bathgate — Harvey Preston
• 1991Dillinger — Harry Copeland
• 1991For the Boys — Roberts, Vietnam
• 1991Murder in High Places — Wayne
• 1991Not of This World — Bruce MacNamara
• 1991Terminator 2: Judgment Day — Todd Voight
• Grand — Jeffrey
• 1990Internal Affairs — Rudy Mohr
• Law & Order — Clay Pollack
• 1990Short Time — Stark
• Super Force — Dr. Landru
• 1990The Assassin — John Patrick Earl
• 1990The Grifters — Lt. Pierson
• 1990The Guardian — Detective
• 1990The Gumshoe Kid — Monty Griswold
• 1990The Last of the Finest — Fast Eddie
• 1990The Rookie — Blackwell
• 1989L.A. Takedown — Waingro
• 1989The Fabulous Baker Boys — Lloyd
• 1988Deadly Dreams — Jack Torme
• 1988Tapeheads — Ricky Fell
• 1988The Lawless Land — Ez Andy
• 1988The Verne Miller Story — Cardogan
• 1987Straight to Hell — Preacher McMahon
• 1987Walker — Byron Cole
• Wiseguy — Ray Spiotta
• 1986Omega Syndrome — Yo-Yo
• 1986Sid and Nancy — Bowery Snax
• Moonlighting — Scalper
• The Twilight Zone — (segment "Take My Life...Please!")
• 1985Volunteers — Kent Sutcliffe
• Miami Vice — Tommy Lowell
• Riptide — Taxi Driver
• The A-Team — Baker, Sergeant Wilson
• Cagney & Lacey — Maurice
• Remington Steele — Dan Kowalski
• 1982Tag: The Assassination Game — Connally
• Tales of the Gold Monkey — Eric Fromby
• Falcon Crest — Buzz Whitehead
• 1981Fire on the Mountain
• 1981Mommie Dearest — Christopher Crawford
• Hart to Hart — Christopher Hawks
• The Incredible Hulk — Tom
• M*A*S*H — Marine
• A Great Depression
• Day One
• Paradise: Disturbed
• Path Lights — Father
• Relapse — Seymour

Appearances as themselves (4)

• 2024Americans with No Address — Self
• Dead Talk Live — Self - Guest
• 2012That Guy... Who Was in That Thing — Self
• 100 Scariest Movie Moments — Self