Johnny Galecki

Known for: Acting

Born: 1975-04-30 (age 51)

From: Bree, Belgium

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.

Filmography (60)

MOVIE★ 6.8
I'm Chevy Chase and You're Not
2025
as Self
MOVIE
The Little Dog Laughed
2020
as Alex
TV
Stars in the House
2020
as Self
MOVIE
Unraveling the Mystery: A Big Bang Farewell
2019
as Self - Host
MOVIE★ 8.1
A Dog's Journey
2019
as Henry Montgomery
TV★ 7.0
The Conners
2018
as David Healy
TV
SciJinks
2018
as Self - Host
MOVIE★ 5.1
The Cleanse
2018
as Paul Berger
MOVIE★ 5.0
Rings
2017
as Gabriel Brown
MOVIE★ 4.0
Must See TV: An All Star Tribute to James Burrows
2016
as Self
TV★ 6.1
The Late Show with Stephen Colbert
2015
as Self - Guest
TV★ 6.4
Lip Sync Battle
2015
as Self
MOVIE★ 6.3
CBGB
2013
as Terry Ork
MOVIE★ 7.0
In Time
2011
as Borel
TV★ 7.2
Conan
2010
as Self
TV★ 3.0
The Talk
2010
as Self
MOVIE★ 4.6
Table for Three
2009
as Ted
MOVIE★ 6.4
Hancock
2008
as Jeremy
TV★ 7.9
The Big Bang Theory
2007
as Leonard Hofstadter
TV★ 3.0
Boulevard of Broken Dreams
2007
as Self (archive footage)
TV★ 7.6
My Name Is Earl
2005
as Scott
TV★ 7.0
American Dad!
2005
as Arnie (voice)
MOVIE★ 5.6
Happy Endings
2005
as Miles (uncredited)
TV★ 6.8
The Late Late Show with Craig Ferguson
2005
as Self
TV★ 7.3
LAX
2004
as Leland Pressman
TV★ 7.4
Entourage
2004
as Johnny Galecki
MOVIE★ 5.8
Chrystal
2004
as Barry
TV★ 5.4
Hope & Faith
2003
as Jay
TV★ 5.5
The Ellen DeGeneres Show
2003
as Self
MOVIE★ 6.4
Bookies
2003
as Jude
MOVIE★ 6.8
Vanilla Sky
2001
as Peter Brown
MOVIE★ 6.1
Morgan's Ferry
2001
as Darcy
MOVIE★ 5.8
Bounce
2000
as Seth
MOVIE★ 6.0
Playing Mona Lisa
2000
as Arthur
TV★ 7.1
The Norm Show
1999
as Dale Stackhouse
TV★ 7.4
Family Guy
1999
as Leonard Hofstadter (voice)
TV★ 8.2
Batman Beyond
1999
as Knux (voice)
MOVIE★ 6.1
The Opposite of Sex
1998
as Jason Bock
MOVIE★ 6.0
I Know What You Did Last Summer
1997
as Max Neurick
MOVIE★ 6.6
Suicide Kings
1997
as Ira Reder
MOVIE★ 6.5
Bean
1997
as Stingo Wheelie
MOVIE★ 3.7
Murder at My Door
1996
as Teddy McNair
MOVIE★ 7.2
Without Consent
1994
as Marty
MOVIE★ 4.9
Sudden Fury
1993
as Daniel Hannigan
TV★ 7.0
Billy
1992
as David MacGregor
TV★ 4.5
Civil Wars
1991
as Greg Stolbach
MOVIE★ 5.6
Backfield in Motion
1991
as Tim Seavers
MOVIE★ 4.7
In Defense of a Married Man
1990
as Eric
TV★ 5.3
American Dreamer
1990
as Danny Nash
TV★ 6.2
Blossom
1990
as Jason
TV★ 6.4
Blind Faith
1990
as John Marshall
MOVIE★ 7.2
National Lampoon's Christmas Vacation
1989
as Rusty Griswold
MOVIE★ 6.0
Prancer
1989
as Billy Quinn
TV★ 7.0
Hardball
1989
TV★ 6.8
Roseanne
1988
as David Healy
MOVIE★ 5.0
A Night in the Life of Jimmy Reardon
1988
as Toby Reardon
MOVIE★ 5.0
Murder Ordained
1987
as Doug Rule
TV★ 4.3
Entertainment Tonight
1981
as Self
TV★ 9.2
People's Choice Awards
1975
as Self - Presenter
TV
Peep Show
—
as Mark