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  • BIRTH 29/05/1947
  • Country United States
  • SHOWS 44
  • MOVIES 23
  • PRODUCTION 1

Michael O'Neill

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​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.

Michael O'Neill

Shows (44)

Prison Break
Prison Break
Herb Stanton
Grey's Anatomy
Grey's Anatomy
Gary Clark
S.W.A.T. (2017)
S.W.A.T. (2017)
Carl Luca
Criminal Minds
Criminal Minds
Det. Yarbough
The Mentalist
The Mentalist
Sheriff Nelson
This Is Us
This Is Us
Arlo
Tom Clancy's Jack Ryan
Tom Clancy's Jack Ryan
Senator Mitchell Chapin
NCIS
NCIS
Riley McCallister
Fringe
Fringe
Sheriff Velchik
The Resident
The Resident
Joshua Williams
11.22.63
11.22.63
Arliss Price
Sons of Anarchy
Sons of Anarchy
Anthony Franklin
The X-Files
The X-Files
Patrol Captain Van Gelder
Fire Country
Fire Country
Harlan Denbo
Bates Motel
Bates Motel
Nick Ford
Ghost Whisperer
Ghost Whisperer
Nolan
Scandal (2012)
Scandal (2012)
Lonnie Mencken
24
24
Richard Walsh / Richard Welsh
ER
ER
Col. Ken Kilner
NCIS: Los Angeles
NCIS: Los Angeles
Ret. U.S. Army General Richard Collins
Happy's Place
Happy's Place
Jim Jackoway
Shooter
Shooter
Ray Brooks
Outer Range
Outer Range
Judge Pettigrew
Echoes
Echoes
Victor McCleary
Messiah (2020)
Messiah (2020)
Cameron Collier
Roswell
Roswell
Philip Evans
Rizzoli & Isles
Rizzoli & Isles
Jonathan McKnight
Without a Trace
Without a Trace
Thomas Shannon
FlashForward
FlashForward
CIA Director Keller
Leverage
Leverage
Judge Roy
The West Wing
The West Wing
Ron Butterfield
The Glades
The Glades
Trent Staley
Rectify
Rectify
Senator Roland Foulkes
JAG
JAG
Commander Bradley
Extant
Extant
Alan Sparks
Crossing Jordan
Crossing Jordan
Chris Benz
The Unit
The Unit
Ron Cheals
The Romanoffs
The Romanoffs
Ron Hopkins
Manhattan
Manhattan
Psychiatrist
Law & Order: Los Angeles
Law & Order: Los Angeles
Jeb Monroe
The Shining
The Shining
Daniel Edwards (uncredited)
Commander In Chief
Commander In Chief
Congressman Wilcox
Diagnosis Murder
Diagnosis Murder
Sheriff Buck O'Hara
The Nine
The Nine
Pete Burton

Movies (23)

Transformers
Transformers
Tom Banacheck
Air
Air
Joe Dean
Dallas Buyers Club
Dallas Buyers Club
Richard Barkley
Green Zone
Green Zone
Colonel Bethel
Dreamcatcher
Dreamcatcher
General Matheson
The Legend of Bagger Vance
The Legend of Bagger Vance
O.B. Keeler
Seabiscuit
Seabiscuit
Mr. Pollard
Nothing But the Truth
Nothing But the Truth
CIA Director
Sea of Love
Sea of Love
Raymond Brown
Ghost Story
Ghost Story
Churchill
Jennifer Eight
Jennifer Eight
Serato
The Sunchaser
The Sunchaser
Agent Moreland
Blind Justice
Blind Justice
Spencer Heymen
Secondhand Lions
Secondhand Lions
Ralph
Danger One
Danger One
Beckwith
Lorenzo's Oil
Lorenzo's Oil
School Psychologist
The Stand at Paxton County
The Stand at Paxton County
Dell Connelly
The Grim Sleeper
The Grim Sleeper
Detective Simms
The Mod Squad
The Mod Squad
Greene
Bushwhacked
Bushwhacked
Jon Jordan
Indivisible
Indivisible
Chaplain Rogers
The Gun in Betty Lou's Handbag
The Gun in Betty Lou's Handbag
Jergens
Clemency
Clemency
Chaplain David Kendricks

Production

On Yoga: The Architecture of Peace
On Yoga: The Architecture of Peace