Acting

2020

(1 episode) as Self

2018		The Conners (4 episodes) as David Healy
2018		SciJinks (8 episodes) as Himself - Host

2015

(1 episode) as Self

2010

(1 episode) as Self

2007		The Big Bang Theory (279 episodes) as Leonard Hofstadter
2007		Boulevard of Broken Dreams (1 episode) as (archive footage)

2005		My Name Is Earl (1 episode) as Scott
2005		American Dad! (2 episodes) as Arnie (voice)
2005		The Late Late Show with Craig Ferguson (1 episode) as Self

2004

(1 episode) as Leland Pressman

2003

(3 episodes) as Jay

1999		Family Guy (1 episode) as Leonard Hofstadter (voice)
1999		Batman Beyond (1 episode) as Knux (voice)

1992

(13 episodes) as David MacGregor

1991

(1 episode) as Greg Stolbach

1990		American Dreamer (17 episodes) as Danny Nash
1990		Blossom (1 episode) as Jason
1990		Blind Faith (2 episodes) as John Marshall

1989

(1 episode)

1988

(92 episodes) as David Healy

1981

(2 episodes) as Self

Production

2018

(8 episodes) … Executive Producer