
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-dr…

Transformers
2007
Tom Banacheck

Grey's Anatomy
2005
Gary Clark

Dallas Buyers Club
2013
Richard Barkley

Prison Break
2005
Herb Stanton

The Mentalist
2008
Sheriff Nelson

Criminal Minds
2005
Det. Yarbough

The X-Files
1993
Patrol Captain Van Gelder

Sons of Anarchy
2008
Anthony Franklin

Fringe
2008
Sheriff Velchik

J. Edgar
2011
Senator McKellar

NCIS
2003
Riley McCallister

Traffic
2000
Lawyer Rodman

Green Zone
2010
Colonel Bethel

Air
2023
Joe Dean

Dreamcatcher
2003
Gen. Matheson

Ghost Whisperer
2005
Nolan

Tom Clancy's Jack Ryan
2018
Senator Mitchell Chapin

24
2001
Richard Welsh

24
2001
Richard Walsh

Bates Motel
2013
Nick Ford
