Johnny galecki: John Mark

John Mark " Johnny" Galecki (born April 30, 1975) is a Belgian-born American actor best known for his role as Dr. Leonard Hofstadter in the hit sitcom The Big Bang Theory from 2007 to 2019 and as David Healy in the sitcom Roseanne from 1992 to 1997 and 2018. 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). Galecki was born in Bree, Belgium, to American... Johnny Galecki is an American actor, who rose to notoriety for playing the character of Leonard in The Big Bang Theory. However, he is not making the headlines for the show, but he is always in the news because of his love life. Johnny Galecki was born in Bree, Belgium on April 30, 1975. He is of American nationality and part of mixed ethnicity with Polish, Irish, and Italian descendants. His birth sign is Taurus. Johnny is the son of Richard and Mary Louise and shared his childhood with ... Johnny Galecki rose to fame with roles in Roseanne, The Big Bang Theory and more — but he has since stepped back from acting. After appearing in theater productions as a child, Galecki made... Find out what the actor who played Leonard Hofstadter has been up to since the sitcom ended in 2019. Learn about his son, his friendship with Randy Houser, his return to Roseanne, and his absence from Hollywood.