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John Mark "Johnny" Galecki (born April 30, 1975) is an Americanmarker actor. He is best known for his roles as David Healy in the sitcom Roseanne, Rusty Griswold in National Lampoon's Christmas Vacation, and as Leonard Hofstadter, Ph.D, in the CBS sitcom The Big Bang Theory.

Early life

Galecki was born in Bree, Belgiummarker, to American parents. His mother, Mary Lou, is a mortgage consultant, and his father, Richard Galecki, was a member of the U.S. Air Force stationed in Belgium and also worked as a rehabilitation teacher. He has a brother, Nick, and a sister, Allison. Galecki moved to Oak Park, Illinoismarker, with his family when he was three years old.


In 1989, he played Russell "Rusty" Griswold in National Lampoon's Christmas Vacation. His best known early role, though, was as David Healy (first introduced as Kevin Healy) in the U.S.marker sitcom Roseanne. His character was the artistically talented, curly-haired, soft-spoken boyfriend (later husband) of Darlene, the droll, tomboyish second daughter of the Conner family played by Sara Gilbert. Galecki was cast in similar roles in the 1997 summer slasher I Know What You Did Last Summer as a jealous loser who has an eye for Jennifer Love Hewitt and the 1998 dark comedy The Opposite of Sex as a gay teen who lies about being molested. In the year 2000, Galecki took a bit of a twist and reunited with the same filmmaker who cast him in Bounce as Seth (a gay man), an assistant to Ben Affleck's character Buddy Amaral, who also helps dodge out with his love life.

Galecki continued his film streak with other David Healy-like roles in Suicide Kings as a nebbishy rich kid who folds easily under pressure and brief bit parts in high-profile films such as Bean as a bad-boyfriend biker and a minor supporting part in Vanilla Sky. Galecki showed that he had range as an actor with typecast-breaking roles like a young criminal delinquent in A Family Torn Apart, a TV movie based on a true story about a serial murderer and the death of a pair of parents.

Galecki appeared in a first-season episode of My Name Is Earl as a golfer. Without his knowledge and to get free beer, Earl and Randy improve his golf score by making it appear that he got numerous holes-in-one. His obsession with improving his golf game without Earl and Randy's assistance destroys his life he loses his job and girlfriend and is forced to live out of his car.

He played a character named Trouty on TBS's sitcom My Boys. He also played the half-brother of the main characters, sisters Hope Shanowski and Faith Fairfield, in the TV sitcom Hope & Faith. In late 2006/early 2007, Galecki starred in the Broadwaymarker play The Little Dog Laughed as Alex, a male prostitute. In this role, he was required to do a full-frontal nude scene, the first of his acting career. "At its core, the play is about what we all sacrifice to be successful, whatever our careers or goals," he explains. Galecki originated the role earlier in 2006 at Second Stage Theatre. The widely popular comedy by Douglas Carter Beane had a successful run at Second Stage and moved to the Cort Theatre. The play closed on February 18, 2007.

Galecki currently stars as Leonard Hofstadter, Ph.D, on the CBS sitcom The Big Bang Theory, which debuted September 24, 2007. His Roseanne co-star Sara Gilbert who also played his girlfriend and later, his wife, in Roseanne, has appeared as a recurring character for the show. Laurie Metcalf, who played Jackie on Roseanne, also has had a few cameos as his co-star Sheldon Cooper's (played by Jim Parsons) mother. Galecki appeared briefly in the 2008 superhero comedy Hancock, alongside Will Smith and Jason Bateman. He also appears in the music video of the Dave Matthews Band song "Satellite".

He plays the cello and has played it while in different characters.



Year Film Role Other notes
1987 Murder Ordained Doug Rule TV movie
1988 A Night in the Life of Jimmy Reardon Toby Reardon
1989 Prancer Billy Quinn
National Lampoon's Christmas Vacation Russell 'Rusty' Griswold
1990 Blind Faith John Marshall TV movie
In Defense of a Married Man Eric TV movie
1991 Backfield in Motion Tim Seavers TV movie
1993 A Family Torn Apart Daniel Hannigan TV movie
1994 Without Consent Marty TV movie
1996 Murder at My Door Teddy McNair TV movie
1997 Bean Stingo Wheelie
Suicide Kings Ira Reder
I Know What You Did Last Summer Max Neurick
1998 The Opposite of Sex Jason Bock
2000 Playing Mona Lisa Arthur
Bounce Seth
2001 Morgan's Ferry Darcy
Vanilla Sky Peter Brown
2003 Bookies Jude
2004 Chrystal Barry
White Like Me Marcus Short film
2005 Happy Endings Miles Uncredited role
2007 Who You Know David Short film
2008 Hancock Jeremy
2009 Table for Three Ted Direct-to-video release

TV series

Year(s) Title Role Seasons Notes
1990–91 American Dreamer Danny Nash 1 Appeared in 17 episodes.
1992–97 Roseanne David Healy 4-9 Appeared in 92 episodes. Nominated for four and winner of one Young Artist Award.
2007-present The Big Bang Theory Leonard Hofstadter 1-3

TV appearances

Year Title Role Episode titles Notes
1990 Hardball "The Hunt for Honus Wagner" Season 1, episode 18
1991 Blossom Jason "Sex, Lies and Teenagers" Season 1, episode 5
1993 Civil Wars Student accused of cheating "Split Ends" Season 2, episode 14
2000 Batman Beyond Knux (voice) "April Moon" Season 2, episode 22
The Norm Show Dale Stockhouse "Norm vs. Youth: Part 1" Season 3, episode 7
"Norm vs. Youth: Part 2" Season 3, episode 8
2004 LAX Leland Pressman "Finnegan Again, Begin Again" Season 1, episode 2
2005 My Name Is Earl Scott "Stole Beer from a Golfer" Season 1, episode 7
Hope & Faith Jay "Blood Is Thicker Than Daughter" Season 3, episode 9
2006 "The Restaurant" Season 3, episode 18
"Jay Date" Season 3, episode 19
American Dad! Arnie (voice) "Irregarding Steve" Season 2, episode 8
My Boys Trouty "Clubhouse Poison" Season 1, episode 6
"Take One for the Team" Season 1, episode 10
2007 "Ethics" Season 1, episode 16


  1. Johnny Galecki Biography (1975-)
  2. TV Guide - Johnny Galecki
  3. Biography page at

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