Johnny Galecki then and now #johnnygalecki #thebigbangtheory #roseanne

John Mark Galecki (born April 30, 1975) is an American actor. He played Leonard Hofstadter in the CBS sitcom The Big Bang Theory (2007–2019) for which he received a Primetime Emmy Award nomination, and David Healy in the ABC sitcoms Roseanne (1992–1997; 2018) and The Conners (2018–2019). Galecki also appeared in the films National Lampoon's Christmas Vacation (1989), Prancer (1989), Suicide Kings (1997), I Know What You Did Last Summer (1997), Bookies (2003), In Time (2011), and Rings (2017).

Galecki was one of the highest paid television actors in the world, with his role in The Big Bang Theory earning him approximately US$900,000 per episode between 2017 and 2019. In 2018, he was estimated to be the world's second highest-paid male TV actor by Forbes (behind only his The Big Bang Theory co-star Jim Parsons), earning $25 million.

Galecki appeared briefly in the 2008 superhero comedy Hancock, alongside Will Smith and Jason Bateman. In July 2011, he played a parody version of himself in three episodes of Entourage. He also appeared in the film In Time (2011) with Justin Timberlake and Amanda Seyfried.

Galecki appeared in one episode of the 2018 revival of Roseanne on ABC. The show, despite its high ratings, was cancelled after Roseanne Barr posted a racist and controversial tweet about Valerie Jarrett. Roseanne was replaced by a new program, The Conners, which premiered in October 2018 and featured the same cast without Barr. Galecki has occasionally appeared as David on The Conners.

Johnny Galecki some of his best works:

"Roseanne" (1988-1997, 2018): Galecki played the role of David Healy, the boyfriend of Darlene Conner in the popular sitcom "Roseanne". He received critical acclaim for his portrayal of the troubled and sensitive character.

"The Big Bang Theory" (2007-2019): Galecki played the role of Leonard Hofstadter in the popular sitcom "The Big Bang Theory". His character was a brilliant experimental physicist who often found himself in awkward situations with his socially inept friends.

"National Lampoon's Christmas Vacation" (1989): Galecki played the role of Rusty Griswold, the son of Clark and Ellen Griswold in the popular Christmas comedy film. He was just 14 years old at the time.

"Hancock" (2008): Galecki had a small but memorable role as Jeremy, the publicist of superhero John Hancock played by Will Smith.

"I Know What You Did Last Summer" (1997): Galecki played the role of Max Neurick, one of the main characters in this horror movie. He was part of a group of teenagers who were being stalked by a killer.

"In Time" (2011): Galecki played the role of Borel, a Timekeeper in the science fiction thriller film directed by Andrew Niccol.

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