Johnny Galecki
Known for
Johnny Galecki, born in Belgium in 1975 to American parents and raised near Chicago, was a child actor by the late eighties, playing Rusty in 'National Lampoon's Christmas Vacation' (1989) and later David Healy on 'Roseanne' (1992-1997). His defining role came as Leonard Hofstadter, the long-suffering experimental physicist of 'The Big Bang Theory' (2007-2019), the romantic and comic centre of one of the most-watched sitcoms of its era. Film credits include 'I Know What You Did Last Summer' (1997) and 'In Time' (2011). His register: exasperated decency with impeccable timing.
Johnny Galecki
22 Movies
17 Series
Johnny Galecki, born in Belgium in 1975 to American parents and raised near Chicago, was a child actor by the late eighties, playing Rusty in 'National Lampoon's Christmas Vacation' (1989) and later David Healy on 'Roseanne' (1992-1997). His defining role came as Leonard Hofstadter, the long-suffering experimental physicist of 'The Big Bang Theory' (2007-2019), the romantic and comic centre of one of the most-watched sitcoms of its era. Film credits include 'I Know What You Did Last Summer' (1997) and 'In Time' (2011). His register: exasperated decency with impeccable timing.
Movies
Plays Borel
In Time
2011
Plays Rusty Griswold
National Lampoon's Christmas Vacation
1989
Plays Peter Brown
Vanilla Sky
2001
Plays Henry Montgomery
A Dog's Journey
2019
Plays Jeremy
Hancock
2008
Plays Max Neurick
I Know What You Did Last Summer
1997
Plays Stingo Wheelie
Bean
1997
Plays Gabriel Brown
Rings
2017
Plays Seth
Bounce
2000
Plays Billy Quinn
Prancer
1989
Plays Ira Reder
Suicide Kings
1997
Plays Jason Bock
The Opposite of Sex
1998
Producer
Plays Paul Berger
The Cleanse
2018
Plays Toby Reardon
A Night in the Life of Jimmy Reardon
1988
Plays Terry Ork
CBGB
2013
Plays Jude
Bookies
2003
Plays Arthur
Playing Mona Lisa
2000
Plays Ted
Table for Three
2009
Plays Darcy
Morgan's Ferry
2001
Plays Barry
Chrystal
2004
TV Shows
Plays Leonard Hofstadter
The Big Bang Theory
2007
Plays David Healy
Roseanne
1988
Plays Danny Nash
American Dreamer
1990
Plays David MacGregor
Billy
1992
Producer
Plays Self - Host
SciJinks
2018
Plays David Healy
The Conners
2018
Plays Jay
Hope & Faith
2003
Plays Johnny Galecki
Entourage
2004
Plays John Marshall
Blind Faith
1990
Plays Dale Stackhouse
The Norm Show
1999
Plays Knux (voice)
Batman Beyond
1999
Plays Arnie (voice)
American Dad!
2005
Plays Leonard Hofstadter (voice)
Family Guy
1999
Plays Scott
My Name Is Earl
2005
Plays Leland Pressman
LAX
2004
Plays Jason
Blossom
1990
Plays Greg Stolbach
Civil Wars
1991
Latest Trailers
Watch Trailer
I'm Chevy Chase and You're Not
Full Filmography
The Little Dog Laughed
Alex
2020
Film
The Conners
David Healy · 4 episodes
2018–2019
TV
A Dog's Journey
Henry Montgomery
2019
Film
SciJinks
Self - Host · 8 episodes
2018
TV
The Cleanse
Paul Berger
2018
Film
Rings
Gabriel Brown
2017
Film
CBGB
Terry Ork
2013
Film
In Time
Borel
2011
Film
Family Guy
Leonard Hofstadter (voice) · 1 episode
2009
TV
Photos
Frequently Asked Questions
How old is Johnny Galecki and where are they from?
Johnny Galecki is 51 years old, born on April 30, 1975 in Bree, Belgium.
What are the most famous roles of Johnny Galecki?
Johnny Galecki is best known for roles in In Time, Hancock, Vanilla Sky.
How many movies has Johnny Galecki been in?
Over a 39-year career (since 1987), Johnny Galecki has appeared in 22 movies and 16 TV shows.
What was Johnny Galecki's first movie?
The career of Johnny Galecki began with Murder Ordained (1987).
What is Johnny Galecki's most recent movie or series?
Johnny Galecki's most recent release is I'm Chevy Chase and You're Not, which premiered on December 4, 2025.
What TV shows has Johnny Galecki appeared in?
On television, Johnny Galecki has appeared in The Big Bang Theory, Family Guy, American Dad!, My Name Is Earl.
Johnny Galecki
1975-04-30 · 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.