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Michael O'Neill

Known For: Acting
Born: May 29, 1947
Place of Birth: Montgomery, Alabama, USA

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 …

Filmography

War of the Worlds

2025 · Secretary of Defense Walter Crystal

Bride Hard

2025 · Frank

Happy Face

2025 · D.A. Craig Calloway

Happy's Place

2024 · Jim Jackoway

Tracker

2024 · Buck Avery

Air

2023 · Joe Dean

Fire Country

2022 · Harlan Denbo

Echoes

2022 · Victor McCleary

Outer Range

2022 · Judge Pettigrew

Cold Call

2021 · Christian

The Stand at Paxton County

2020 · Dell Connelly

Messiah

2020 · Cameron Collier

Clemency

2019 · Chaplain David Kendricks

Indivisible

2018 · Chaplain Rogers

The Romanoffs

2018 · Ron Hopkins

Danger One

2018 · Beckwith

Tom Clancy's Jack Ryan

2018 · Senator Mitchell Chapin

The Resident

2018 · Joshua Williams

S.W.A.T.

2017 · Carl Luca

On Yoga: The Architecture of Peace

2017 · Producer

Shooter

2016 · Ray Brooks

This Is Us

2016 · Arlo

11.22.63

2016 · Arliss Price

Manhattan

2014 · Psychiatrist

Extant

2014 · Alan Sparks

The Grim Sleeper

2014 · Detective Simms

Dallas Buyers Club

2013 · Richard Barkley

Rectify

2013 · Senator Roland Foulkes

Bates Motel

2013 · Nick Ford

Vegas

2012 · Mayor Ted Bennett

Scandal

2012 · Lonnie Mencken

J. Edgar

2011 · Senator McKellar

Law & Order: LA

2010 · Jeb Monroe

Rizzoli & Isles

2010 · Jonathan McKnight

The Glades

2010 · Trent Staley

Green Zone

2010 · Colonel Bethel

Flying Lessons

2010 · Chief Dobbs

FlashForward

2009 · CIA Director Keller

NCIS: Los Angeles

2009 · Ret. U.S. Army General Richard Collins

Nothing but the Truth

2008 · CIA Director

Leverage

2008 · Judge Roy

A Quiet Little Marriage

2008 · Bruce

The Mentalist

2008 · Sheriff Nelson

Fringe

2008 · Sheriff Velchik

Sons of Anarchy

2008 · Anthony Franklin

Crazy

2008 · Ralph Christianson

Transformers

2007 · Tom Banacheck

Army Wives

2007 · Reverend Bankerd

The Nine

2006 · Pete Burton

The Unit

2006 · Ron Cheals

Commander in Chief

2005 · Congressman Wilcox

Ghost Whisperer

2005 · Nolan

Criminal Minds

2005 · Det. Yarbough

Close to Home

2005 · Don Wheeler

Prison Break

2005 · Herb Stanton

Grey's Anatomy

2005 · Gary Clark

Numb3rs

2005 · Boyd Keene

Around the Bend

2004 · Cowboy

Boston Legal

2004 · Dr. Robert McLean

LAX

2004 · Alonso Mathews

American Crime

2004 · Sheriff Smyth

NCIS

2003 · Riley McCallister

Secondhand Lions

2003 · Ralph

Seabiscuit

2003 · Mr. Pollard

Dreamcatcher

2003 · Gen. Matheson

The Emperor's Club

2002 · Co-Producer

Without a Trace

2002 · Thomas Shannon

CSI: Miami

2002 · Jerry Blackburn

24

2001 · Richard Welsh, Richard Walsh

Crossing Jordan

2001 · Chris Benz

Traffic

2000 · Lawyer Rodman

The Legend of Bagger Vance

2000 · O.B. Keeler

Boston Public

2000 · Dr. Bernard Colbert

Roswell

1999 · Philip Evans

The West Wing

1999 · Ron Butterfield

ATF

1999 · ATF Asst. Director Ben Walker

The Mod Squad

1999 · Greene

Dancer, Texas Pop. 81

1998 · Mr. Lusk

Virtual Obsession

1998

Standoff

1998 · Cult Leader (Voice)

Ally McBeal

1997 · Dr. Colbert

The Shining

1997 · Daniel Edwards (uncredited)

The Practice

1997 · Judge Robert Temple

Millennium

1996 · County Prosecutor Calvin Smith

The Sunchaser

1996 · Agent Moreland

JAG

1995 · Commander Bradley

Bushwhacked

1995 · Jon Jordan

Awake to Danger

1995 · Detective Brickman

Beyond Betrayal

1994 · Ray Pasquerello

ER

1994 · Col. Ken Kilner

Chicago Hope

1994 · Bill Wyzinski

One West Waikiki

1994

Blind Justice

1994 · Spencer Heymen

Victim of Love: The Shannon Mohr Story

1993 · Dick Britton

Diagnosis: Murder

1993 · Sheriff Buck O'Hara

The X-Files

1993 · Patrol Captain Van Gelder

For Their Own Good

1993 · Clark Thompson

Lorenzo's Oil

1992 · School Psychologist

Jennifer Eight

1992 · Serato

The Gun in Betty Lou's Handbag

1992 · Jergens

An Unremarkable Life

1989 · Michael

Sea of Love

1989 · Raymond Brown

Ghost Story

1981 · Churchill

Michael O'Neill · Virelixia