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John Mark "Johnny" Galecki is a Belgian-born American actor. He is best known for his role as Leonard Hofstadter in the sitcom The Big Bang Theory since 2007 and as David Healy in the sitcom Roseanne from 1992 to 1997. He also appeared in the films National Lampoon's Christmas Vacation, Suicide Kings, I Know What You Did Last Summer, Bookies, Hancock, and In Time.