Acting
William Duffy is an actor.
The Mentalist
2008 · TSA Agent #2
Criminal Minds
2005 · Dr. Larson
Heroes
2006 · ER Doctor
NCIS
2003 · Harris Cobb
It's Always Sunny in Philadelphia
2005 · Hedge Fund Guy
Blast from the Past
1999 · Workman #1
The O.C.
2003 · (voice)
Beverly Hills, 90210
1990 · Doorman
Bosch
2015 · Vault Attendant
Law & Order
1990 · CSU Technician
Scandal
2012 · Ralph Greenwald
The West Wing
1999 · Staffer
A West Wing Special to Benefit When We All Vote
2020 · Larry
The Ascent
2010 · Thomas Shaw
Parenthood
2010 · Mr. Carlson
Carpoolers
2007
Karla
2006 · Detective Porter
Waist Deep
2006 · Newscaster #2
Sniper 3
2004 · Richard Addis
American Dreams
2002 · Father Gregory
The Division
2001 · Commander Jackson
Double Tap
1997 · Gas Man
Betrayed by Love
1994 · Paxton
Hearts Afire
1992 · Doctor
The Two Jakes
1990 · Desk Sergeant
Death Game
1977 · Executive Producer
