Cast & creator
Johnny Galecki
Best known for The Late Show with Stephen Colbert, Family Guy, American Dad!
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.
Also known as: Џони Галецки, Τζόνι Γκαλέκι, 자니 갈렉키, 強尼·格萊奇, جانی گالکی
32
film credits
31
television credits
61
1975–2025 · acting roles
6.2
average across scored titles
Signature credits
Known for
Across film & television
Filmography (63)
Showing 63 of 63 credits
The Late Show with Stephen Colbert
Self - Guest
2015
Family Guy
Leonard Hofstadter (voice)
1999
American Dad!
Arnie (voice)
2005
Conan
Self
2010Conan
Self - Guest
2010
The Late Late Show with Craig Ferguson
Self
2005
The Ellen DeGeneres Show
Self
2003
Entourage
Johnny Galecki
2004
The Talk
Self
2010
My Name Is Earl
Scott
2005
The Big Bang Theory
Leonard Hofstadter
2007
Batman Beyond
Knux (voice)
1999
The Conners
David Healy
2018
Stars in the House
Self
2020
Lip Sync Battle
Self
2015
Blossom
Jason
1990
Hope & Faith
Jay
2003
People's Choice Awards
Self - Presenter
1975
In Time
Borel
2011
Entertainment Tonight
Self
1981
The Norm Show
Dale Stackhouse
1999
LAX
Leland Pressman
2004
National Lampoon's Christmas Vacation
Rusty Griswold
1989
Vanilla Sky
Peter Brown
2001
Civil Wars
Greg Stolbach
1991
Hancock
Jeremy
2008
I Know What You Did Last Summer
Max Neurick
1997
Roseanne
David Healy
1988
A Dog's Journey
Henry Montgomery
2019
Hardball
1989
Rings
Gabriel Brown
2017
American Dreamer
Danny Nash
1990
Bean
Stingo Wheelie
1997
The Opposite of Sex
Jason Bock
1998
Happy Endings
Miles (uncredited)
2005
Bounce
Seth
2000
I'm Chevy Chase and You're Not
Self
2025
Blind Faith
John Marshall
1990
CBGB
Terry Ork
2013
The Cleanse
Paul Berger
2018The Cleanse
Producer
2018
Suicide Kings
Ira Reder
1997Peep Show
Mark
Billy
David MacGregor
1992Boulevard of Broken Dreams
Self (archive footage)
2007
A Night in the Life of Jimmy Reardon
Toby Reardon
1988
Prancer
Billy Quinn
1989
Must See TV: An All Star Tribute to James Burrows
Self
2016
Murder Ordained
Doug Rule
1987
Murder at My Door
Teddy McNair
1996
Sudden Fury
Daniel Hannigan
1993
In Defense of a Married Man
Eric
1990
Bookies
Jude
2003
Table for Three
Ted
2009
Unraveling the Mystery: A Big Bang Farewell
Self - Host
2019
Playing Mona Lisa
Arthur
2000
Morgan's Ferry
Darcy
2001
The Little Dog Laughed
Alex
2020
Without Consent
Marty
1994
SciJinks
Self - Host
2018SciJinks
Executive Producer
2018
Chrystal
Barry
2004
Backfield in Motion
Tim Seavers
1991