Michael O'Neill
Known for Acting · 100 credits
- Born
- 1947-05-29 (age 79)
- Place of birth
- Montgomery, Alabama, USA
- Also known as
- مایکل اونیل
Biography
From Wikipedia, the free encyclopedia.
Michael O'Neill (born May 29, 1951) is an American actor. With a career stretching through three decades, he usually portrays senior law enforcement or military officers. He is perhaps best known for his role as Special agent Ron Butterfield, the head of President Josiah Bartlet's Secret Service detail, on The West Wing. He played CTU Administrative Director Richard Walsh in the first two episodes of 24. He played Sgt. Maj. Ron Cheals in the CBS action-drama series The Unit. He starred in the Season Six 2 part Finale of Grey's Anatomy as the broken widower who holds the hospital hostage with a 9mm while pursuing the doctors responsible for unplugging his wife. His most notable film performances occur in Seabiscuit, Secondhand Lions, Transformers, Dancer, Texas Pop 81, Traffic, Sea of Love, A Quiet Little Marriage, Nothing But the Truth, and Green Zone. O'Neill graduated from Auburn University in 1974. After attending Auburn he spent time under the tutelage of actor Will Geer and his daughter, Ellen, at Theatricum Botanicum in Los Angeles before moving to New York to pursue his career there.
Known For
TV Shows (58)
Grey's Anatomy
2005
as Gary Clark
NCIS
2003
as Riley McCallister
Criminal Minds
2005
as Det. Yarbough
The Mentalist
2008
as Sheriff Nelson
S.W.A.T.
2017
as Carl Luca
Prison Break
2005
as Herb Stanton
CSI: Miami
2002
as Jerry Blackburn
The Resident
2018
as Joshua Williams
24
2001
as Richard Walsh / Richard Welsh
Tracker
2024
as Buck Avery
NCIS: Los Angeles
2009
as Ret. U.S. Army General Richard Collins
The X-Files
1993
as Patrol Captain Van Gelder
Tom Clancy's Jack Ryan
2018
as Senator Mitchell Chapin
Sons of Anarchy
2008
as Anthony Franklin
ER
1994
as Col. Ken Kilner
Crossing Jordan
2001
as Chris Benz
JAG
1995
as Commander Bradley
The West Wing
1999
as Ron Butterfield
Fringe
2008
as Sheriff Velchik
Without a Trace
2002
as Thomas Shannon
Diagnosis: Murder
1993
as Sheriff Buck O'Hara
Boston Legal
2004
as Dr. Robert McLean
Ghost Whisperer
2005
as Nolan
Rizzoli & Isles
2010
as Jonathan McKnight
Scandal
2012
as Lonnie Mencken
This Is Us
2016
as Arlo
Chicago Hope
1994
as Bill Wyzinski
The Practice
1997
as Judge Robert Temple
Numb3rs
2005
as Boyd Keene
Army Wives
2007
as Reverend Bankerd
Bates Motel
2013
as Nick Ford
The Unit
2006
as Ron Cheals
Fire Country
2022
as Harlan Denbo
Boston Public
2000
as Dr. Bernard Colbert
Leverage
2008
as Judge Roy
Millennium
1996
as County Prosecutor Calvin Smith
Shooter
2016
as Ray Brooks
Roswell
1999
as Philip Evans
Close to Home
2005
as Don Wheeler
The Glades
2010
as Trent Staley
Law & Order: LA
2010
as Jeb Monroe
FlashForward
2009
as CIA Director Keller
Ally McBeal
1997
as Dr. Colbert
Outer Range
2022
as Judge Pettigrew
Manhattan
2014
as Psychiatrist
Rectify
2013
as Senator Roland Foulkes
Extant
2014
as Alan Sparks
Commander in Chief
2005
as Congressman Wilcox
11.22.63
2016
as Arliss Price
The Romanoffs
2018
as Ron Hopkins
Messiah
2020
as Cameron Collier
LAX
2004
as Alonso Mathews
One West Waikiki
1994
Happy Face
2025
as D.A. Craig Calloway
The Shining
1997
as Daniel Edwards (uncredited)
Happy's Place
2024
as Jim Jackoway
The Nine
2006
as Pete Burton
Echoes
2022
as Victor McCleary
Movies (42)
War of the Worlds
2025
as Secretary of Defense Walter Crystal
Air
2023
as Joe Dean
Transformers
2007
as Tom Banacheck
Dreamcatcher
2003
as Gen. Matheson
Dallas Buyers Club
2013
as Richard Barkley
Traffic
2000
as Lawyer Rodman
Bride Hard
2025
as Frank
Seabiscuit
2003
as Mr. Pollard
J. Edgar
2011
as Senator McKellar
Sea of Love
1989
as Raymond Brown
Green Zone
2010
as Colonel Bethel
Around the Bend
2004
as Cowboy
Secondhand Lions
2003
as Ralph
The Legend of Bagger Vance
2000
as O.B. Keeler
Lorenzo's Oil
1992
as School Psychologist
The Sunchaser
1996
as Agent Moreland
Ghost Story
1981
as Churchill
Bushwhacked
1995
as Jon Jordan
Nothing But the Truth
2008
as CIA Director
Clemency
2019
as Chaplain David Kendricks
Jennifer Eight
1992
as Serato
American Crime
2004
as Sheriff Smyth
Flying Lessons
2010
as Chief Dobbs
Standoff
1998
as Cult Leader (Voice)
ATF
1999
as ATF Asst. Director Ben Walker
Cold Call
2021
as Christian
Blind Justice
1994
as Spencer Heymen
Danger One
2018
as Beckwith
Crazy
2008
as Ralph Christianson
The Grim Sleeper
2014
as Detective Simms
The Gun in Betty Lou's Handbag
1992
as Jergens
Virtual Obsession
1998
Indivisible
2018
as Chaplain Rogers
The Mod Squad
1999
as Greene
An Unremarkable Life
1989
as Michael
Victim of Love: The Shannon Mohr Story
1993
as Dick Britton
A Quiet Little Marriage
2008
as Bruce
For Their Own Good
1993
as Clark Thompson
The Stand at Paxton County
2020
as Dell Connelly
Dancer, Texas Pop. 81
1998
as Mr. Lusk
Awake to Danger
1995
as Detective Brickman
Beyond Betrayal
1994
as Ray Pasquerello
About Michael O'Neill
From Wikipedia, the free encyclopedia. Michael O'Neill (born May 29, 1951) is an American actor. With a career stretching through three decades, he usually portrays senior law enforcement or military officers. He is perhaps best known for his role as Special agent Ron Butterfield, the head of President Josiah Bartlet's Secret Service detail, on The West Wing. He played CTU Administrative Director Richard Walsh in the first two episodes of 24. He played Sgt. Maj. Ron Cheals in the CBS action-drama series The Unit. He starred in the Season Six… With 100 credits spanning from 1981 to 2025, Michael O'Neill has appeared in 42 films and 58 TV shows.
Fans searching for Michael O'Neill movies, Michael O'Neill filmography, or the latest projects starring Michael O'Neill can stream many of these titles on CineFlixo, free and in HD, with no subscription required.
Most Popular Michael O'Neill Movies
- War of the Worlds (2025) — as Secretary of Defense Walter Crystal
- Air (2023) — as Joe Dean
- Transformers (2007) — as Tom Banacheck
- Dreamcatcher (2003) — as Gen. Matheson
- Dallas Buyers Club (2013) — as Richard Barkley
Where to Watch Michael O'Neill Films
Most Michael O'Neill movies and series are available to stream on CineFlixo in full HD, completely free and without signup. Browse the complete filmography above to jump directly to any title. For more films and the latest web series featuring Michael O'Neill, check our movies catalogue and browse page.