Michael O'Neill
Known for: Acting
Born: May 29, 1947
Place of birth: Montgomery, Alabama, USA
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.
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Filmography
44 movies · 59 TV shows, newest first
4.0
War of the Worlds
2025
5.5
Bride Hard
2025
6.8
Happy Face
2025
6.7
Happy's Place
2024
7.6
Tracker
2024
7.3
Air
2023
8.0
Fire Country
2022
6.6
Echoes
2022
6.9
Outer Range
2022
NR
Cold Call
2021
5.9
The Stand at Paxton County
2020
7.3
Messiah
2020
6.3
Clemency
2019
7.0
Indivisible
2018
6.4
The Romanoffs
2018
6.1
Danger One
2018
7.7
Tom Clancy's Jack Ryan
2018
8.4
The Resident
2018
8.0
S.W.A.T.
2017
7.5
On Yoga: The Architecture of Peace
2017
7.2
Shooter
2016
8.2
This Is Us
2016
7.8
11.22.63
2016
7.0
Manhattan
2014
6.3
Extant
2014
4.9
The Grim Sleeper
2014
7.9
Dallas Buyers Club
2013
7.6
Rectify
2013
8.1
Bates Motel
2013
6.9
Vegas
2012
7.2
Scandal
2012
6.2
J. Edgar
2011
6.8
Law & Order: LA
2010
7.9
Rizzoli & Isles
2010
7.0
The Glades
2010
6.5
Green Zone
2010
5.6
Flying Lessons
2010
7.0
FlashForward
2009
7.5
NCIS: Los Angeles
2009
6.9
Nothing but the Truth
2008
7.6
Leverage
2008
5.1
A Quiet Little Marriage
2008
8.4
The Mentalist
2008
8.1
Fringe
2008
8.4
Sons of Anarchy
2008
5.5
Crazy
2008
6.8
Transformers
2007
7.5
Army Wives
2007
5.8
The Nine
2006
7.4
The Unit
2006
7.5
Commander in Chief
2005
8.1
Ghost Whisperer
2005
8.3
Criminal Minds
2005
5.9
Close to Home
2005
8.1
Prison Break
2005
8.2
Grey's Anatomy
2005
7.0
Numb3rs
2005
5.9
Around the Bend
2004
7.9
Boston Legal
2004
7.3
LAX
2004
3.7
American Crime
2004
7.6
NCIS
2003
7.2
Secondhand Lions
2003
7.1
Seabiscuit
2003
5.7
Dreamcatcher
2003
7.1
The Emperor's Club
2002
7.2
Without a Trace
2002
7.7
CSI: Miami
2002
7.8
24
2001
7.2
Crossing Jordan
2001
7.1
Traffic
2000
6.6
The Legend of Bagger Vance
2000
7.7
Boston Public
2000
7.7
Roswell
1999
8.3
The West Wing
1999
5.8
ATF
1999
4.4
The Mod Squad
1999
7.0
Dancer, Texas Pop. 81
1998
4.1
Virtual Obsession
1998
6.0
Standoff
1998
6.5
Ally McBeal
1997
6.3
The Shining
1997
7.6
The Practice
1997
7.7
Millennium
1996
6.3
The Sunchaser
1996
7.3
JAG
1995
5.4
Bushwhacked
1995
6.8
Awake to Danger
1995
6.5
Beyond Betrayal
1994
7.8
ER
1994
7.2
Chicago Hope
1994
7.7
One West Waikiki
1994
5.3
Blind Justice
1994
7.6
Victim of Love: The Shannon Mohr Story
1993
7.1
Diagnosis: Murder
1993
8.4
The X-Files
1993
6.3
For Their Own Good
1993
7.1
Lorenzo's Oil
1992
6.1
Jennifer Eight
1992
5.1
The Gun in Betty Lou's Handbag
1992
10.0
An Unremarkable Life
1989
6.6
Sea of Love
1989
6.0
Ghost Story
1981