John Mark "Johnny" Galecki also known as Jon Galecki stands 5’5” tall and is of Polish, Irish and Italian descent. He was born on April 30, 1975 in Bree, Belgium. His family relocated to Chicago when he was 3 where they would take him to local theaters to audition. He is an American actor well-known for his character as David Healy in the ABC sitcom “Roseanne”, Peter Brown in the 2001 movie “Vanilla Sky”, and as Leonard Hofstadter in the hit CBS sitcom “The Big Bang Theory”. Galecki made his first acting appearance in the CBS miniseries “Murder Ordained” in 1987. Galecki has been very quiet when it comes to his personal life. He dated The Big Bang Theory co-star Kaley Cuoco, which was not publicized until their broke up. And just recently, it has been confirmed that he’s dating actress Kelli Garner since 2011.