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Johnny Galecki

Actor

John Mark Galecki is an actor. He is known for playing David Healy in the ABC sitcom Roseanne from 1992 to 1997 and Dr. Leonard Hofstadter in the CBS sitcom The Big Bang Theory since 2007. Galecki also appeared in the films National Lampoon's Christmas Vacation (1989), Prancer (1989), Suicide Kings (1997), I Know What You Did Last Summer (1997), Bookies (2003), and In Time (2011).

John Mark Galecki is an actor. He is known for playing David Healy in the ABC sitcom Roseanne from 1992 to 1997 and Dr. Leonard Hofstadter in the CBS sitcom The Big Bang Theory since 2007. Galecki also appeared in the films National Lampoon's Christmas Vacation (1989), Prancer (1989), Suicide Kings (1997), I Know What You Did Last Summer (1997), Bookies (2003), and In Time (2011).

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