Michael O'Neill
Acting
102
Acting Credits
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
Filmography
War of the Worlds
2025
as Secretary of Defense Walter Crystal
Bride Hard
2025
as Frank
Happy Face
2025
as D.A. Craig Calloway
Happy's Place
2024
as Jim Jackoway
Tracker
2024
as Buck Avery
Air
2023
as Joe Dean
Echoes
2022
as Victor McCleary
Fire Country
2022
as Harlan Denbo
Outer Range
2022
as Judge Pettigrew
Cold Call
2021
as Christian
The Stand at Paxton County
2020
as Dell Connelly
Messiah
2020
as Cameron Collier
Clemency
2019
as Chaplain David Kendricks
Indivisible
2018
as Chaplain Rogers
Danger One
2018
as Beckwith
The Resident
2018
as Joshua Williams
Tom Clancy's Jack Ryan
2018
as Senator Mitchell Chapin
The Romanoffs
2018
as Ron Hopkins
S.W.A.T.
2017
as Carl Luca
This Is Us
2016
as Arlo
11.22.63
2016
as Arliss Price
Shooter
2016
as Ray Brooks
The Grim Sleeper
2014
as Detective Simms
Extant
2014
as Alan Sparks
Manhattan
2014
as Psychiatrist
Dallas Buyers Club
2013
as Richard Barkley
Bates Motel
2013
as Nick Ford
Rectify
2013
as Senator Roland Foulkes
Scandal
2012
as Lonnie Mencken
Vegas
2012
as Mayor Ted Bennett
J. Edgar
2011
as Senator McKellar
Green Zone
2010
as Colonel Bethel
Flying Lessons
2010
as Chief Dobbs
The Glades
2010
as Trent Staley
Rizzoli & Isles
2010
as Jonathan McKnight
Law & Order: LA
2010
as Jeb Monroe
FlashForward
2009
as CIA Director Keller
NCIS: Los Angeles
2009
as Ret. U.S. Army General Richard Collins
A Quiet Little Marriage
2008
as Bruce
Nothing But the Truth
2008
as CIA Director
Crazy
2008
as Ralph Christianson
Sons of Anarchy
2008
as Anthony Franklin
The Mentalist
2008
as Sheriff Nelson
Fringe
2008
as Sheriff Velchik
Leverage
2008
as Judge Roy
Transformers
2007
as Tom Banacheck
Army Wives
2007
as Reverend Bankerd
The Nine
2006
as Pete Burton
The Unit
2006
as Ron Cheals
Ghost Whisperer
2005
as Nolan
Grey's Anatomy
2005
as Gary Clark
Prison Break
2005
as Herb Stanton
Commander in Chief
2005
as Congressman Wilcox
Criminal Minds
2005
as Det. Yarbough
Numb3rs
2005
as Boyd Keene
Close to Home
2005
as Don Wheeler
Around the Bend
2004
as Cowboy
American Crime
2004
as Sheriff Smyth
LAX
2004
as Alonso Mathews
Boston Legal
2004
as Dr. Robert McLean
Dreamcatcher
2003
as Gen. Matheson
Secondhand Lions
2003
as Ralph
Seabiscuit
2003
as Mr. Pollard
NCIS
2003
as Riley McCallister
Without a Trace
2002
as Thomas Shannon
CSI: Miami
2002
as Jerry Blackburn
24
2001
as Richard Walsh
24
2001
as Richard Welsh
Crossing Jordan
2001
as Chris Benz
The Legend of Bagger Vance
2000
as O.B. Keeler
Traffic
2000
as Lawyer Rodman
Boston Public
2000
as Dr. Bernard Colbert
ATF
1999
as ATF Asst. Director Ben Walker
The Mod Squad
1999
as Greene
Roswell
1999
as Philip Evans
The West Wing
1999
as Ron Butterfield
Dancer, Texas Pop. 81
1998
as Mr. Lusk
Virtual Obsession
1998
Standoff
1998
as Cult Leader (Voice)
The Shining
1997
as Daniel Edwards (uncredited)
Ally McBeal
1997
as Dr. Colbert
The Practice
1997
as Judge Robert Temple
The Sunchaser
1996
as Agent Moreland
Millennium
1996
as County Prosecutor Calvin Smith
Bushwhacked
1995
as Jon Jordan
Awake to Danger
1995
as Detective Brickman
JAG
1995
as Commander Bradley
Blind Justice
1994
as Spencer Heymen
Beyond Betrayal
1994
as Ray Pasquerello
Chicago Hope
1994
as Bill Wyzinski
One West Waikiki
1994
ER
1994
as Col. Ken Kilner
For Their Own Good
1993
as Clark Thompson
Victim of Love: The Shannon Mohr Story
1993
as Dick Britton
The X-Files
1993
as Patrol Captain Van Gelder
Diagnosis: Murder
1993
as Sheriff Buck O'Hara
The Gun in Betty Lou's Handbag
1992
as Jergens
Jennifer Eight
1992
as Serato
Lorenzo's Oil
1992
as School Psychologist
An Unremarkable Life
1989
as Michael
Sea of Love
1989
as Raymond Brown
Ghost Story
1981
as Churchill