William Duffy is an actor, known for The West Wing (1999), It's Always Sunny in Philadelphia (2005) and Scandal (2012).
Its Always Sunny in Philadelphia - Season 8
Hearts Afire - Season 1
ER - Season 13
Beverly Hills 90210 - Season 7
Bosch - Season 4
Its Always Sunny in Philadelphia - Season 14
Its Always Sunny in Philadelphia - Season 11
Beverly Hills 90210 - Season 3
The Invaders - Season 1 (1995)
Its Always Sunny in Philadelphia - Season 3
American Dreams - Season 2
Bosch - Season 7
Criminal Minds - Season 7
Heroes - Season 2
Its Always Sunny in Philadelphia - Season 9
The West Wing - Season 7
A West Wing Special to benefit When We All Vote
Studio 60 on the Sunset Strip - Season 1
Scandal - Season 1
Beverly Hills 90210 - Season 6
Karla
Third Watch - Season 3
Its Always Sunny in Philadelphia - Season 5
Bosch - Season 3
The Two Jakes
The Mentalist - Season 4