Michael O'Neill
Born in Montgomery, Alabama, USA — May 29 1947
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-drama series The Unit. He starred in the Season Six 2 part Fin…
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Michael O'Neill's Credits
Browse acting and crew credits across movies and TV — filter and sort to find specific roles.
Grey's Anatomy
Gary Clark
NCIS
Riley McCallister
The Mentalist
Sheriff Nelson
Criminal Minds
Det. Yarbough
The X-Files
Patrol Captain Van Gelder
CSI: Miami
Jerry Blackburn
24
Richard Welsh
NCIS: Los Angeles
Ret. U.S. Army General Richard Collins
S.W.A.T.
Carl Luca
JAG
Commander Bradley
The West Wing
Ron Butterfield
Prison Break
Herb Stanton
Fringe
Sheriff Velchik
War of the Worlds
Secretary of Defense Walter Crystal
Diagnosis: Murder
Sheriff Buck O'Hara
Without a Trace
Thomas Shannon
Crossing Jordan
Chris Benz
This Is Us
Arlo
The Resident
Joshua Williams
Sons of Anarchy
Anthony Franklin
Boston Legal
Dr. Robert McLean
Scandal
Lonnie Mencken
Ghost Whisperer
Nolan
ER
Col. Ken Kilner
Rizzoli & Isles
Jonathan McKnight
The Practice
Judge Robert Temple
Numb3rs
Boyd Keene
Chicago Hope
Bill Wyzinski
Bates Motel
Nick Ford
Army Wives
Reverend Bankerd
Leverage
Judge Roy
Millennium
County Prosecutor Calvin Smith
Tom Clancy's Jack Ryan
Senator Mitchell Chapin
Boston Public
Dr. Bernard Colbert
Shooter
Ray Brooks
The Unit
Ron Cheals
Close to Home
Don Wheeler
Roswell
Philip Evans
Fire Country
Harlan Denbo
Extant
Alan Sparks
Messiah
Cameron Collier
The Glades
Trent Staley
FlashForward
CIA Director Keller
Law & Order: LA
Jeb Monroe
Ally McBeal
Dr. Colbert
Manhattan
Psychiatrist
Commander in Chief
Congressman Wilcox
Outer Range
Judge Pettigrew
Rectify
Senator Roland Foulkes
11.22.63
Arliss Price
Traffic
Lawyer Rodman
Happy's Place
Jim Jackoway
The Romanoffs
Ron Hopkins
One West Waikiki
The Shining
Daniel Edwards (uncredited)
Happy Face
D.A. Craig Calloway
LAX
Alonso Mathews
Air
Joe Dean
Bride Hard
Frank
Dallas Buyers Club
Richard Barkley
The Nine
Pete Burton
Echoes
Victor McCleary
J. Edgar
Senator McKellar
Seabiscuit
Mr. Pollard
Green Zone
Colonel Bethel
Sea of Love
Raymond Brown
Secondhand Lions
Ralph
Transformers
Tom Banacheck
Dreamcatcher
Gen. Matheson
The Legend of Bagger Vance
O.B. Keeler
Bushwhacked
Jon Jordan
Ghost Story
Churchill
Lorenzo's Oil
School Psychologist
Around the Bend
Cowboy
Jennifer Eight
Serato
Nothing But the Truth
CIA Director
Crazy
Ralph Christianson
The Emperor's Club
Production
Clemency
Chaplain David Kendricks
The Sunchaser
Agent Moreland
The Mod Squad
Greene
Indivisible
Chaplain Rogers
ATF
ATF Asst. Director Ben Walker
Standoff
Cult Leader (Voice)
Danger One
Beckwith
American Crime
Sheriff Smyth
Blind Justice
Spencer Heymen
Flying Lessons
Chief Dobbs
A Quiet Little Marriage
Bruce
Victim of Love: The Shannon Mohr Story
Dick Britton
Dancer, Texas Pop. 81
Mr. Lusk
For Their Own Good
Clark Thompson
The Gun in Betty Lou's Handbag
Jergens
The Grim Sleeper
Detective Simms
Virtual Obsession
Awake to Danger
Detective Brickman
The Stand at Paxton County
Dell Connelly
Beyond Betrayal
Ray Pasquerello
An Unremarkable Life
Michael
On Yoga: The Architecture of Peace
Production
Cold Call
Christian