Michael O'Neill
Known For
Acting
Born
1947-05-29 in Montgomery, Alabama, USA
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.
Most Known For
Grey's Anatomy
as Gary Clark
NCIS
as Riley McCallister
Criminal Minds
as Det. Yarbough
The X-Files
as Patrol Captain Van Gelder
War of the Worlds
as Secretary of Defense Walter Crystal
The Mentalist
as Sheriff Nelson
Prison Break
as Herb Stanton
24
as Richard Welsh
24
as Richard Walsh
S.W.A.T.
as Carl Luca
This Is Us
as Arlo
NCIS: Los Angeles
as Ret. U.S. Army General Richard Collins
The West Wing
as Ron Butterfield
JAG
as Commander Bradley
CSI: Miami
as Jerry Blackburn
Fringe
as Sheriff Velchik
Sons of Anarchy
as Anthony Franklin
Rizzoli & Isles
as Jonathan McKnight
ER
as Col. Ken Kilner
Scandal
as Lonnie Mencken