William Duffy is an actor.

KNOWN FOR

The Mentalist
2014
Law & Order
1992
NCIS
2016
Criminal Minds
2012
The West Wing
1999
Beverly Hills, 90210
1994
It's Always Sunny in Philadelphia
2013
Heroes
2009
Scandal
2017
Bosch
2016
The O.C.
2007
Parenthood
2013

FILMOGRAPHY

All
Movies
TV
Acting
27
Producing
1
2020
A West Wing Special to Benefit When We All Vote
as Larry
2017
Scandal
as Ralph Greenwald
2016
Bosch
as Vault Attendant
2016
NCIS
as Harris Cobb
2014
The Mentalist
as TSA Agent #2
2013
Parenthood
as Mr. Carlson
2013
It's Always Sunny in Philadelphia
as Hedge Fund Guy
2012
Criminal Minds
as Dr. Larson
2010
The Ascent
as Thomas Shaw
2009
Heroes
as ER Doctor
2007
The O.C.
as (voice)
2007
Carpoolers
2006
Karla
as Detective Porter
2006
Waist Deep
as Newscaster #2
2004
Sniper 3
as Richard Addis
2004
The Division
as Commander Jackson
2003
American Dreams
as Father Gregory
1999
Blast from the Past
as Workman #1
1999
The West Wing
as Staffer
1997
Double Tap
as Gas Man
1994
Betrayed by Love
as Paxton
1994
Hearts Afire
as Doctor
1994
Beverly Hills, 90210
as Doorman
1992
Law & Order
as CSU Technician
1990
The Two Jakes
as Desk Sergeant
1970
Loving
as Jay
1965
Brainstorm
as Orderly (uncredited)