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.

Johnny Galecki

Acting Born April 30, 1975 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.

Known For

The Late Show with Stephen Colbert

Self - Guest

Family Guy

Leonard Hofstadter (voice)

American Dad!

Arnie (voice)

Conan

Self

Conan

Self - Guest

The Late Late Show with Craig Ferguson

Self

The Big Bang Theory

Leonard Hofstadter

The Ellen DeGeneres Show

Self

Entourage

Johnny Galecki

My Name Is Earl

Scott

Batman Beyond

Knux (voice)

The Conners

David Healy