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Johnny Galecki

John Mark "Johnny" Galecki (born April 30, 1975) is an American actor best known for his role as Dr. Leonard Hofstadter in The Big Bang Theory since 2007 and as David Healy in Roseanne from 1992–97. He also appeared in the films National Lampoon's Christmas Vacation (1989), Suicide Kings (1997), I Know What You Did Last Summer (1997), Bookies (2003), Hancock (2008), and In Time (2011).
Early life
Galecki was born in Bree, Belgium, to American parents of Polish, Irish, and Italian descent. His mother, Mary Lou Noon, was a mortgage consultant, and his father, Richard Galecki (deceased), was a member of the U.S. Air Force stationed in Belgium and also worked as a rehabilitation teacher. Galecki is the eldest of three children with a brother, Nick, whom he describes as a "mechanical genius" in the automotive industry, and a sister, Allison. Galecki grew up in Oak Park, Illinois
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