Actor John Mark Galecki was born in Bree, Belgium and is of Polish, Irish, and Italian descent. HE is famously known for his role of Dr. Leonard Hofstadter in the CBS sitcom series 'The Big Bang Theory' since 2007. Galecki made his acting debut in the 1987 CBS miniseries 'Murder Ordained' and went on to portray the character of Rusty Griswold in 'National Lampoon's Christmas Vacation'. One of his best-known roles was as David Healy in the sitcom show 'Roseanne'. Galecki had made a brief appearance in the 2008 superhero comedy 'Hancock', alongside Will Smith and Jason Bateman
Born on: 30 April, 1975
Born in: Bree, Flanders, Belgium
Height: 5' 5"