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.
The Big Bang Theory
Leonard Hofstadter
Roseanne
David Healy
A Dog's Journey
Henry Montgomery
In Time
Borel
National Lampoon's Christmas Vacation
Rusty Griswold
Billy
David MacGregor
Vanilla Sky
Peter Brown
Hancock
Jeremy
