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John Mark Galecki (born April 30, 1975) is an American actor. He played Leonard Hofstadter in the CBS sitcom The Big Bang Theory (2007–2019) for which he received a Primetime Emmy Award nomination, and David Healy in the ABC sitcoms Roseanne (1992–1997; 2018) and The Conners (2018–2019). Galecki also appeared in the films Prancer (1989), National Lampoon's Christmas Vacation (1989), Suicide Kings (1997), I Know What You Did Last Summer (1997), Bookies (2003), In Time (2011), and Rings (2017).
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A Dog's Journey
2019 · as Henry Montgomery
Rings
2017 · as Gabriel Brown
In Time
2011 · as Borel
Hancock
2008 · as Jeremy
Vanilla Sky
2002 · as Peter Brown
Bounce
2000 · as Seth
I Know What You Did Last Summer
1997 · as Max Neurick
National Lampoon's Christmas Vacation
1989 · as Rusty Griswold
Prancer
1989 · as Billy Quinn