
Michael O'Neill
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-dr…
Known For
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Filmography
Acting (99)
Movies (42)
War of the Worlds
2025as Secretary of Defense Walter Crystal
Bride Hard
2025as Frank
Air
2023as Joe Dean
Cold Call
2021as Christian
The Stand at Paxton County
2020as Dell Connelly
Clemency
2019as Chaplain David Kendricks
Indivisible
2018as Chaplain Rogers
Danger One
2018as Beckwith
The Grim Sleeper
2014as Detective Simms
Dallas Buyers Club
2013as Richard Barkley
J. Edgar
2011as Senator McKellar
Green Zone
2010as Colonel Bethel
Flying Lessons
2010as Chief Dobbs
Nothing But the Truth
2008as CIA Director
Crazy
2008as Ralph Christianson
A Quiet Little Marriage
2008as Bruce
Transformers
2007as Tom Banacheck
American Crime
2004as Sheriff Smyth
Around the Bend
2004as Cowboy
Dreamcatcher
2003as Gen. Matheson
Secondhand Lions
2003as Ralph
Seabiscuit
2003as Mr. Pollard
Traffic
2000as Lawyer Rodman
The Legend of Bagger Vance
2000as O.B. Keeler
The Mod Squad
1999as Greene
ATF
1999as ATF Asst. Director Ben Walker
Dancer, Texas Pop. 81
1998as Mr. Lusk
Standoff
1998as Cult Leader (Voice)
Virtual Obsession
1998
The Sunchaser
1996as Agent Moreland
Awake to Danger
1995as Detective Brickman
Bushwhacked
1995as Jon Jordan
Blind Justice
1994as Spencer Heymen
Beyond Betrayal
1994as Ray Pasquerello
For Their Own Good
1993as Clark Thompson
Victim of Love: The Shannon Mohr Story
1993as Dick Britton
Lorenzo's Oil
1992as School Psychologist
Jennifer Eight
1992as Serato
The Gun in Betty Lou's Handbag
1992as Jergens
Sea of Love
1989as Raymond Brown
An Unremarkable Life
1989as Michael
Ghost Story
1981as Churchill
Television (57)
Happy Face
2025as D.A. Craig Calloway
Happy's Place
2024as Jim Jackoway
Fire Country
2022as Harlan Denbo
Outer Range
2022as Judge Pettigrew
Echoes
2022as Victor McCleary
Messiah
2020as Cameron Collier
The Resident
2018as Joshua Williams
Tom Clancy's Jack Ryan
2018as Senator Mitchell Chapin
The Romanoffs
2018as Ron Hopkins
S.W.A.T.
2017as Carl Luca
This Is Us
2016as Arlo
Shooter
2016as Ray Brooks
11.22.63
2016as Arliss Price
Extant
2014as Alan Sparks
Manhattan
2014as Psychiatrist
Bates Motel
2013as Nick Ford
Rectify
2013as Senator Roland Foulkes
Scandal
2012as Lonnie Mencken
Rizzoli & Isles
2010as Jonathan McKnight
Law & Order: LA
2010as Jeb Monroe
The Glades
2010as Trent Staley
NCIS: Los Angeles
2009as Ret. U.S. Army General Richard Collins
FlashForward
2009as CIA Director Keller
The Mentalist
2008as Sheriff Nelson
Fringe
2008as Sheriff Velchik
Sons of Anarchy
2008as Anthony Franklin
Leverage
2008as Judge Roy
Army Wives
2007as Reverend Bankerd
The Unit
2006as Ron Cheals
The Nine
2006as Pete Burton
Grey's Anatomy
2005as Gary Clark
Criminal Minds
2005as Det. Yarbough
Prison Break
2005as Herb Stanton
Numb3rs
2005as Boyd Keene
Ghost Whisperer
2005as Nolan
Close to Home
2005as Don Wheeler
Commander in Chief
2005as Congressman Wilcox
Boston Legal
2004as Dr. Robert McLean
LAX
2004as Alonso Mathews
NCIS
2003as Riley McCallister
Without a Trace
2002as Thomas Shannon
CSI: Miami
2002as Jerry Blackburn
24
2001as Richard Welsh
Crossing Jordan
2001as Chris Benz
Boston Public
2000as Dr. Bernard Colbert
The West Wing
1999as Ron Butterfield
Roswell
1999as Philip Evans
The Practice
1997as Judge Robert Temple
Ally McBeal
1997as Dr. Colbert
The Shining
1997as Daniel Edwards (uncredited)
Millennium
1996as County Prosecutor Calvin Smith
JAG
1995as Commander Bradley
ER
1994as Col. Ken Kilner
Chicago Hope
1994as Bill Wyzinski
One West Waikiki
1994
The X-Files
1993as Patrol Captain Van Gelder
Diagnosis: Murder
1993as Sheriff Buck O'Hara
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