John Mark "Johnny" Galecki (b. 1975) is an American Emmy-nominated actor. He is best known for playing the role of Rusty Griswold in National Lampoon's Christmas Vacation as well as his work on the sitcoms Roseanne and The Big Bang Theory (with Jim Parsons).

Galecki appeared on Sesame Street to explain the word "transform" in a Season 42 Word of the Day segment.

External linksEdit

• IMDb