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