In The Big Bang Theory, fans got to know Leonard, the best friend and roommate of Sheldon. The character, played by Johnny Galecki, was one of the most significant in the show as ...

Johnny Galecki starred in "The Big Bang Theory" for over a decade. While many of his costars continued acting after the ...

American sitcom The Big Bang Theory centers around friends Leonard Hofstadter (Johnny Galecki), Sheldon Cooper (Jim Parsons), Penny Teller (Kaley Cuoco), Howard Wolowitz (Simon Helberg ...

Johnny Galecki is an American actor. He rose to fame as David Healy on ABC's Roseanne (1992-1997). Galecki reprised the role on the Roseanne revival (2018) and its spinoff The Conners (2018-2019).