Johnny Galecki is a Belgian-born American actor, best known for his roles as David Healy in Roseanne, Rusty Griswold in National Lampoon's Christmas Vacation, and as Leonard Hofstadter in The Big Bang Theory.

KNOWN FOR

The Late Show with Stephen Colbert
2019
Family Guy
2009
American Dad!
2006
Conan
2012
The Late Late Show with Craig Ferguson
2011
The Ellen DeGeneres Show
2011
Entourage
2011
The Big Bang Theory
2007
The Talk
2011
My Name Is Earl
2005
Batman Beyond
2000
Stars in the House
2020

FILMOGRAPHY

All
Movies
TV
Acting
61
Producing
2
2025
I'm Chevy Chase and You're Not
as Self
2020
The Little Dog Laughed
as Alex
2020
Stars in the House
as Self
2019
A Dog's Journey
as Henry Montgomery
2019
Unraveling the Mystery: A Big Bang Farewell
as Self - Host
2019
The Late Show with Stephen Colbert
as Self - Guest
2018
The Cleanse
as Paul Berger
2018
SciJinks
as Self - Host
2018
The Conners
as David Healy
2017
Rings
as Gabriel Brown
2016
Must See TV: An All Star Tribute to James Burrows
as Self
2016
Lip Sync Battle
as Self
2016
Entertainment Tonight
as Self
2016
Conan
as Self - Guest
2013
CBGB
as Terry Ork
2013
People's Choice Awards
as Self - Presenter
2012
Conan
as Self
2011
In Time
as Borel
2011
The Late Late Show with Craig Ferguson
as Self
2011
Entourage
as Johnny Galecki
2011
The Ellen DeGeneres Show
as Self
2011
The Talk
as Self
2009
Table for Three
as Ted
2009
Family Guy
as Leonard Hofstadter (voice)
2008
Hancock
as Jeremy
2007
The Big Bang Theory
as Leonard Hofstadter
2007
Boulevard of Broken Dreams
as Self (archive footage)
2006
American Dad!
as Arnie (voice)
2005
Happy Endings
as Miles (uncredited)
2005
Hope & Faith
as Jay
2005
My Name Is Earl
as Scott
2004
Chrystal
as Barry
2004
LAX
as Leland Pressman
2003
Bookies
as Jude
2001
Morgan's Ferry
as Darcy
2001
Vanilla Sky
as Peter Brown
2000
Playing Mona Lisa
as Arthur
2000
Bounce
as Seth
2000
Batman Beyond
as Knux (voice)
2000
The Norm Show
as Dale Stackhouse
1998
The Opposite of Sex
as Jason Bock
1997
Bean
as Stingo Wheelie
1997
I Know What You Did Last Summer
as Max Neurick
1997
Suicide Kings
as Ira Reder
1996
Murder at My Door
as Teddy McNair
1994
Without Consent
as Marty
1993
Sudden Fury
as Daniel Hannigan
1993
Civil Wars
as Greg Stolbach
1992
Roseanne
as David Healy
1992
Billy
as David MacGregor
1991
Backfield in Motion
as Tim Seavers
1991
Blossom
as Jason
1990
In Defense of a Married Man
as Eric
1990
American Dreamer
as Danny Nash
1990
Hardball
1990
Blind Faith
as John Marshall
1989
National Lampoon's Christmas Vacation
as Rusty Griswold
1989
Prancer
as Billy Quinn
1988
A Night in the Life of Jimmy Reardon
as Toby Reardon
1987
Murder Ordained
as Doug Rule
Peep Show
as Mark