Michael O'Neill
🎂 May 29, 1947 (79)
Montgomery, Alabama, USA
Michael O'Neill is an actor born in Montgomery, Alabama, USA. Transformers remains one of their most celebrated performances, playing Tom Banacheck. Other notable titles in their filmography include Dallas Buyers Club and J. Edgar. Over more than 45 years they have gathered close to 42 films and 60 TV productions, working mainly across genres like drama, thriller, sci-fi.
79Age
34Movies
54Series
79
Age
34
Movies
54
Series
Movies
War of the Worlds
2025
Dallas Buyers Club
2013
Transformers
2007
Air
2023
Traffic
2000
Dreamcatcher
2003
Bride Hard
2025
Sea of Love
1989
Green Zone
2010
Secondhand Lions
2003
Seabiscuit
2003
J. Edgar
2011
The Legend of Bagger Vance
2000
Nothing But the Truth
2008
Lorenzo's Oil
1992
Ghost Story
1981
Jennifer Eight
1992
Bushwhacked
1995
The Sunchaser
1996
Danger One
2018
Around the Bend
2004
Clemency
2019
The Mod Squad
1999
Standoff
1998
American Crime
2004
Indivisible
2018
Flying Lessons
2010
Crazy
2008
The Gun in Betty Lou's Handbag
1992
Dancer, Texas Pop. 81
1998
The Stand at Paxton County
2020
A Quiet Little Marriage
2008
TV Shows
The West Wing
1999
Rectify
2013
Extant
2014
Bates Motel
2013
Echoes
2022
The Unit
2006
Scandal
2012
Tom Clancy's Jack Ryan
2018
Messiah
2020
Happy Face
2025
Grey's Anatomy
2005
Boston Public
2000
Vegas
2012
The Nine
2006
NCIS
2003
Shooter
2016
S.W.A.T.
2017
Commander in Chief
2005
Happy's Place
2024
Army Wives
2007
This Is Us
2016
JAG
1995
The X-Files
1993
Roswell
1999
Ghost Whisperer
2005
The Glades
2010
Rizzoli & Isles
2010
24
2001
FlashForward
2009
Law & Order: LA
2010
Latest Trailers
Watch Trailer
War of the Worlds
Full Filmography
War of the Worlds
Secretary of Defense Walter Crystal
2025
Film
Bride Hard
Frank
2025
Film
Happy Face
D.A. Craig Calloway
2025–
TV
Happy's Place
Jim Jackoway
2024–
TV
Tracker
Buck Avery
2024–
TV
Air
Joe Dean
2023
Film
Fire Country
Harlan Denbo
2022–
TV
Echoes
Victor McCleary
2022–
TV
Cold Call
Christian
2021
Film
Photos
Frequently Asked Questions
How old is Michael O'Neill?
Michael O'Neill is 79 years old, born on May 29, 1947 in Montgomery, Alabama, USA.
Where is Michael O'Neill from?
Michael O'Neill was born in Montgomery, Alabama, USA.
What are the most famous roles of Michael O'Neill?
Michael O'Neill is best known as an actor for Transformers, Dallas Buyers Club, J. Edgar.
How many movies has Michael O'Neill been in?
Michael O'Neill has appeared in 42 movies and 59 TV shows.
What was Michael O'Neill's first movie?
Michael O'Neill's first credited film was Ghost Story (1981).
What is Michael O'Neill's most recent movie?
Michael O'Neill's most recent movie is War of the Worlds (2025).
What are Michael O'Neill's best movies?
Michael O'Neill's most acclaimed films include: Transformers (2007), Dallas Buyers Club (2013), J. Edgar (2011), Traffic (2000), Green Zone (2010).
What TV shows has Michael O'Neill appeared in?
Michael O'Neill is known for TV work including: Grey's Anatomy, Prison Break, The Mentalist, Criminal Minds.
How long has Michael O'Neill been working in film?
Michael O'Neill has been active since 1981 — a career spanning 45 years.
Michael O'Neill
1947-05-29 · Montgomery, Alabama, USA
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.