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.
"That person who helps others simply because it should or must be done, and because it is the right thing to do, is indeed without a doubt, a real superhero." -Stan Lee
