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Michael O'Neill

Michael O'Neill

Acting

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 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

Grey's Anatomy
8.2

Follows the personal and professional lives of a group of doctors at Seattle's Grey Sloan Memorial Hospital.

Grey's Anatomy

2005
NCIS
7.6

From murder and espionage to terrorism and stolen submarines, a team of special agents investigates any crime that has any connection to Navy and Marine Corps personnel, regardless of rank or position.

NCIS

2003
Criminal Minds
8.3

An elite team of FBI profilers analyze the country's most twisted criminal minds, anticipating their next moves before they strike again. The Behavioral Analysis Unit's most experienced agent is David Rossi, a founding member of the BAU who returns to help the team solve new cases.

Criminal Minds

2005
The Mentalist
8.4

Patrick Jane, a former celebrity psychic medium, uses his razor sharp skills of observation and expertise at "reading" people to solve serious crimes with the California Bureau of Investigation.

The Mentalist

2008
S.W.A.T.
8.0

A Los Angeles S.W.A.T. sergeant is assigned to lead a highly skilled unit in the community where he grew up. Torn between loyalty to the streets, where the cops are sometimes the enemy, and allegiance to his brothers in blue, he strategically straddles the two worlds.

S.W.A.T.

2017
Tracker
7.5

Lone-wolf survivalist Colter Shaw roams the country as a “reward seeker,” using his expert tracking skills to help private citizens and law enforcement solve all manner of mysteries while contending with his own fractured family.

Tracker

2024
Prison Break
8.1

Due to a political conspiracy, an innocent man is sent to death row and his only hope is his brother, who makes it his mission to deliberately get himself sent to the same prison in order to break the both of them out, from the inside out.

Prison Break

2005
CSI: Miami
7.7

The show follows Crime Scene Investigators working for the Miami-Dade Police Department as they use physical evidence, similar to their Las Vegas counterparts, to solve grisly murders. The series mixes deduction, gritty subject matter, and character-driven drama in the same vein as the original series in the CSI franchise, except that the Miami CSIs are cops first, scientists second.

CSI: Miami

2002
24
7.8

Counterterrorism agent Jack Bauer fights the bad guys of the world, a day at a time. With each week's episode unfolding in real-time, "24" covers a single day in the life of Bauer each season.

24

2001
Tom Clancy's Jack Ryan
7.7

When CIA analyst Jack Ryan stumbles upon a suspicious series of bank transfers his search for answers pulls him from the safety of his desk job and catapults him into a deadly game of cat and mouse throughout Europe and the Middle East, with a rising terrorist figurehead preparing for a massive attack against the US and her allies.

Tom Clancy's Jack Ryan

2018
The X-Files
8.4

The exploits of FBI Special Agents Fox Mulder and Dana Scully who investigate X-Files: marginalized, unsolved cases involving paranormal phenomena. Mulder believes in the existence of aliens and the paranormal while Scully, a skeptic, is assigned to make scientific analyses of Mulder's discoveries that debunk Mulder's work and thus return him to mainstream cases.

The X-Files

1993
NCIS: Los Angeles
7.5

The exploits of the Los Angeles–based Office of Special Projects (OSP), an elite division of the Naval Criminal Investigative Service that specializes in undercover assignments.

NCIS: Los Angeles

2009
ER
7.8

ER explores the inner workings of an urban teaching hospital and the critical issues faced by the dedicated physicians and staff of its overburdened emergency room.

ER

1994
Sons of Anarchy
8.4

The Sons of Anarchy (SOA) are an outlaw motorcycle club with many charters in the United States and overseas. The show focused on the original and founding charter, Sons of Anarchy Motorcycle Club, Redwood Original, often referred to by the acronym SAMCRO, Sam Crow, or simply Redwood Charter. The charter operates both legal and illegal businesses in the small town of Charming, California. They combine gun-running and a garage, and involvement in porn film industry. Clay, the charter president, likes it old school and violent; while Jax, his stepson and the club's VP, has thoughts about changing the way things are done. Their conflict has effects on both the club and their personal relationship, especially when Jax goes on a personal quest to cleanse the SAMCRO name and image.

Sons of Anarchy

2008
JAG
7.3

Harmon "Harm" Rabb Jr. is a former pilot turned lawyer working for the military's JAG (Judge Advocate General) division, the elite legal wing of officers that prosecutes and defends those accused of military-related crimes. He works closely with Lt. Col. Sarah Mackenzie, and together they do what needs to be done to find the truth.

JAG

1995
Fringe
8.1

FBI Special Agent Olivia Dunham, brilliant but formerly institutionalized scientist Walter Bishop and his scheming, reluctant son Peter uncover a deadly mystery involving a series of unbelievable events and realize they may be a part of a larger, more disturbing pattern that blurs the line between science fiction and technology.

Fringe

2008
Without a Trace
7.3

The series follows the ventures of a Missing Persons Unit of the FBI in New York City.

Without a Trace

2002
The West Wing
8.3

The West Wing provides a glimpse into presidential politics in the nation's capital as it tells the stories of the members of a fictional presidential administration. These interesting characters have humor and dedication that touches the heart while the politics that they discuss touch on everyday life.

The West Wing

1999
The Resident
8.4

A tough, brilliant senior resident guides an idealistic young doctor through his first day, pulling back the curtain on what really happens, both good and bad, in modern-day medicine.

The Resident

2018
War of the Worlds
4.1

Will Radford is a top analyst for Homeland Security who tracks potential threats through a mass surveillance program, until one day an attack by an unknown entity leads him to question whether the government is hiding something from him... and from the rest of the world.

War of the Worlds

2025