An image from The Big Bang Theory, one of the productions that also features Johnny Galecki.
Johnny Galecki
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.