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