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.
Bean
Stingo Wheelie
I Know What You Did Last Summer
Max Neurick
National Lampoon's Christmas Vacation
Rusty Griswold
Hancock
Jeremy
The Opposite of Sex
Jason Bock
Bookies
Jude
A Night in the Life of Jimmy Reardon
Toby Reardon
In Time
Borel
Morgan's Ferry
Darcy
Playing Mona Lisa
Arthur
CBGB
Terry Ork
Murder at My Door
Teddy McNair
Vanilla Sky
Peter Brown
Backfield in Motion
Tim Seavers
Sudden Fury
Daniel Hannigan
The Cleanse
Paul Berger
Bounce
Seth
Rings
Gabriel Brown
Murder Ordained
Doug Rule
Must See TV: An All Star Tribute to James Burrows
Self
Without Consent
Marty
Suicide Kings
Ira Reder
Prancer
Billy Quinn
Happy Endings
Miles (uncredited)
Chrystal
Barry
In Defense of a Married Man
Eric
The Little Dog Laughed
Alex
A Dog's Journey
Henry Montgomery
Table for Three
Ted
Unraveling The Mystery: A Big Bang Farewell
Self - Host
I'm Chevy Chase and You're Not
Self