Ever wondered how someone who stands at 5 feet 5 inches could loom so large in the collective imagination of Hollywood? Johnny Galecki, the actor who charmed audiences as Leonard Hofstadter in "The Big Bang Theory," proves that talent, not towering height, defines a star.

Born John Mark Galecki on April 30, 1975, in Bree, Belgium, his beginnings were perhaps more cosmopolitan than one might expect for a Chicago-rooted actor. His parents, American citizens, were stationed in Belgium while his father served in the U.S. military. By the time he was three, the Galecki family had relocated to Chicago, Illinois, where Johnny spent his formative years alongside his parents, Mary Lou and Richard Galecki, and his siblings, sister Allison (born in 1980) and brother Nick (born in 1982). His father was of Polish descent.

Category	Information
Full Name	John Mark Galecki
Birth Date	April 30, 1975
Birth Place	Bree, Belgium
Nationality	American
Occupation	Actor
Height	5 feet 5 inches (165 cm)
Net Worth (2024 est.)	$100 million
Parents	Mary Lou and Richard Galecki
Siblings	Allison Galecki (sister), Nick Galecki (brother)
Known For	Leonard Hofstadter in "The Big Bang Theory," David Healy in "Roseanne"
Early Roles	National Lampoon's Christmas Vacation, Roseanne
Other Notable Roles	Suicide Kings, The Opposite of Sex, Bounce, Bookies, Hancock
Talents	Acting, Cello playing
Website	Johnny Galecki IMDB Profile