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Birth name John Mark GaleckiNationality USABirth 30 april 1975
(48 years) at Bree (Belgique
John Mark "Johnny" Galecki (born April 30, 1975) is an American actor. He is known for his role as David Healy in Roseanne from 1992–97 and as Dr. Leonard Hofstadter in The Big Bang Theory since 2007. Galecki 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).
While working on The Big Bang Theory, Galecki dated co-star Kaley Cuoco for about two years until December 2009 while the two also played a couple on the show. Cuoco told CBS Watch that they have remained on good terms since ending their relationship. The pair, along with co-star Mayim Bialik, are vegetarian.
Galecki owns 360 acres (150 ha) of land in Santa Margarita, California. His property includes vineyards and a log cabin.