Michael O'Neill

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 Pres…

Filmography

The Mentalist
The Mentalist
2008 · TV
as Sheriff Nelson
Grey's Anatomy
Grey's Anatomy
2005 · TV
as Gary Clark
NCIS
NCIS
2003 · TV
as Riley McCallister
Criminal Minds
Criminal Minds
2005 · TV
as Det. Yarbough
Prison Break
Prison Break
2005 · TV
as Herb Stanton
S.W.A.T.
S.W.A.T.
2017 · TV
as Carl Luca
CSI: Miami
CSI: Miami
2002 · TV
as Jerry Blackburn
24
24
2001 · TV
as Richard Welsh
24
24
2001 · TV
as Richard Walsh
The X-Files
The X-Files
1993 · TV
as Patrol Captain Van Gelder
The West Wing
The West Wing
1999 · TV
as Ron Butterfield
NCIS: Los Angeles
NCIS: Los Angeles
2009 · TV
as Ret. U.S. Army General Richard Collins
Tracker
Tracker
2024 · TV
as Buck Avery
Sons of Anarchy
Sons of Anarchy
2008 · TV
as Anthony Franklin
War of the Worlds
War of the Worlds
2025 · Movie
as Secretary of Defense Walter Crystal
Chicago Hope
Chicago Hope
1994 · TV
as Bill Wyzinski
Fringe
Fringe
2008 · TV
as Sheriff Velchik
JAG
JAG
1995 · TV
as Commander Bradley
ER
ER
1994 · TV
as Col. Ken Kilner
Tom Clancy's Jack Ryan
Tom Clancy's Jack Ryan
2018 · TV
as Senator Mitchell Chapin
Ghost Whisperer
Ghost Whisperer
2005 · TV
as Nolan
Without a Trace
Without a Trace
2002 · TV
as Thomas Shannon
Diagnosis: Murder
Diagnosis: Murder
1993 · TV
as Sheriff Buck O'Hara
Scandal
Scandal
2012 · TV
as Lonnie Mencken