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