The Big Bang Theory

Johnny Galecki

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The Big Bang Theory Staff
"Johnny Galecki"
Johnny Galecki (The Big Bang Theory)
Gender Male
Birthday April 30, 1975
First Episode Pilot
Role(s) Actor
Portrays Leonard Hofstadter
All of the Big Bang Theory Staff

John Mark "Johnny" Galecki (born April 30, 1975) is a Belgian-born American actor. He is best known for his role as Leonard Hofstadter in the sitcom The Big Bang Theory since 2007 and as David Healy in the sitcom Roseanne from 1992 to 1997. He also appeared in the films National Lampoon's Christmas Vacation (1989), Suicide Kings (1997), I Know What You Did Last Summer (1997), Bookies (2003), Hancock (2008), and In Time (2011).

Early Life Edit

Galecki was born in Bree, Belgium, to American parents of Polish, Irish, and Italian descent. His mother, Mary Lou (née Noon), was a mortgage consultant, and his father, Richard Galecki, was a member of the U.S. Air Force stationed in Belgium at the time and also worked as a rehabilitation teacher. He has a younger brother, Nick, whom he describes as a mechanical genius in the automotive industry and a younger sister, Allison. Galecki grew up in Oak Park, Ill. During an interview with New Zealand radio station ZM, Galecki jokingly recalled his childhood relationship with his mother. As a child, he was well known for making up long, epic stories and tales. In such situations his mother used to make him play the "quiet game" where he had to see how long he could go without talking. He also recalled that despite being a loving mother, she was also very tough. One phrase she would lovingly use was, "I love you, now get out."


Galecki made his acting debut in the 1987 CBS miniseries "Murder Ordained" with JoBeth Williams and future Roseanne co-star John Goodman. In 1989 Galecki portrayed Rusty Griswold in National Lampoon's Christmas Vacation. One of his best known roles was as David Healy (first introduced as Kevin Healy) in the U.S. sitcom Roseanne. Galecki was cast in the 1997 summer I Know What You Did Last Summer and the 1998 dark comedy The Opposite of Sex. In the year 2000, Galecki reunited with Opposite of Sex director Don Roos, who cast him in Bounce.

Galecki continued his film streak with roles in Suicide Kings and brief bit parts in high-profile films such as Bean and a minor supporting part in Vanilla Sky. Galecki played a young delinquent in ''A Family Torn Apart, a TV movie based on a true story about a serial killer.

Galecki appeared in the first-season episode, "Stole Beer from a Golfer", of My Name Is Earl as a golfer.


Sara and Johnny while on the "Roseanne" TV series together

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 Broadway 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 Theater. The widely popular comedy by Douglas Carter Beane had a successful run at Second Stage and moved to the Cort Theater. The play closed on February 18, 2007, with Galecki taking home a 2007 Theater World Award for his performance.

Galecki currently plays the part of Leonard Hofstadter in the CBS sitcom The Big Bang Theory, which debuted September 24, 2007. He works alongside two of his former Roseanne cast members, Sara Gilbert, who during his role as David Healy played the role of his longtime girlfriend and later his wife, Darlene Conner, as well as Laurie Metcalf, formerly cast as the role of Rosanne Barr's fictionalized character's sister Jackie. Both have since appeared as recurring characters. Galecki is a cellist and has played cello on the show.

Galecki appeared briefly in the 2008 superhero comedy Hancock (film), alongside Will Smith and Jason Bateman. He also appears in the music video for the Dave Matthews Band song "Satellite".

In July 2011, Galecki played himself on three episodes of Entourage.



Personal LifeEdit

Galecki owns 360 acres of land in Santa Margarita, California. There are vineyards on his property, and also a log cabin. He is also a vegetarian.

While working on The Big Bang Theory, Galecki dated co-star Kaley Cuoco for two years. They kept their relationship private until they broke up.

In February 2012, it was revealed that Galecki had been dating actress Kelli Garner since 2011.

The Big Bang TheoryEdit

Main article: Leonard Hofstadter

Leonard is an experimental physicist from Caltech who rooms with Sheldon Cooper in their rundown apartment building in apartment 4A, in which the elevator always seems to be out of order due to both of them causing an explosion in it, located in Pasadena, California. He keeps a whiteboard in their living room on which he works on theoretical particle physics. While Sheldon's genius seems to be focused primarily in math and science, Leonard is indicated to be proficient in literature and history as well as the sciences; he is able to solve a woman's crossword puzzle in seconds, Leonard gives the answers being mostly literature based, e.g. Vladimir Nabokov. It is also suggested that Leonard's IQ is not as high as Sheldon's; Sheldon scoffs at Leonard's whiteboard theories as common enough to be "scribbled on the wall of
Cast with Stan Lee

Stan Lee, Parsons, Helberg and Kunal Nayyar.

Leonard Hofstadter

Johnny Galecki as Leonard Leakey Hofstader

every men's room at MIT". Most of the equations on Leonard and Sheldon's boards feature complex higher mathematics, such as virtual particles in QM, or series of Riemann zeta functions. He is originally from New Jersey and is usually seen wearing his characteristic black framed glasses, neutral colored sweat jackets, brown trousers, and physics-themed t-shirts.


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
2011 In Time Borel


Year(s) Title Role Notes
1990 Hardball Unknown role Episode: "The Hunt for Honus Wagner"
1991 Blossom Jason Episode: "Sex, Lies and Teenagers"
1990–1991 American Dreamer Danny Nash 17 episodes.
1993 Civil Wars Student accused of cheating Episode: "Split Ends"
1992–1997 Roseanne David Healy 92 episodes.
Nominated for four and winner of one Young Artist Award.
2000 Batman Beyond Knux (voice) Episode: "April Moon"
The Norm Show Dale Stockhouse Episode: "Norm vs. Youth: Part 1"
Episode: "Norm vs. Youth: Part 2"
2004 LAX Leland Pressman Episode: "Finnegan Again, Begin Again"
2005 My Name Is Earl Scott Episode: "Stole Beer from a Golfer"
Hope & Faith Jay Episode: "Blood Is Thicker Than Daughter"
Episode: "The Restaurant"
Episode: "Jay Date"
2006-2007 My Boys Trouty Episode: "Clubhouse Poison"
Episode: "Take One for the Team"
Episode: "Ethics"
2009 Family Guy Leonard Hofstadter Episode: "Business Guy" (voice only)
2007-present The Big Bang Theory Leonard Hofstadter Starring role


  • Johnny Galecki was originally asked to take the part of Sheldon, but felt the role of Leonard suited his acting style better. The role of Sheldon was then taken by Jim Parsons.
  • His 2015-2017 contract could be worth a total of $90 million.


External linksEdit

v · e · d
Characters, Cast & Crew
Characters Main Leonard Hofstadter  ‧  Sheldon Cooper  ‧  Penny  ‧  Howard Wolowitz  ‧  Rajesh Koothrappali  ‧  Amy Farrah Fowler  ‧  Bernadette Rostenkowski-Wolowitz    Stuart Bloom  ‧  Leslie Winkle    The Social Group
Recurring Mrs. Wolowitz  ‧  Barry Kripke  ‧  Priya Koothrappali  ‧  Dr. V. M. Koothrappali  ‧  Mrs. Koothrappali  ‧  Lucy  ‧  Mrs. Mary Cooper  ‧  Zack Johnson  ‧  Dr. Beverly Hofstadter  ‧  Mike Rostenkowski  ‧  Emily Sweeney  ‧  Alex Jensen  ‧  Professor Proton  ‧  Althea  ‧  Cinnamon
Cast Regulars Johnny Galecki  ‧  Jim Parsons  ‧  Kaley Cuoco-Sweeting  ‧  Simon Helberg  ‧  Kunal Nayyar  ‧  Mayim Bialik  ‧  Melissa Rauch  ‧  Kevin Sussman  ‧  Sara Gilbert  ‧  Carol Ann Susi  ‧  John Ross Bowie
As Selves Wil Wheaton  ‧  Mike Massimino  ‧  Stephen Hawking  ‧  Katee Sackhoff  ‧ Steve Wozniak  ‧ Buzz Aldrin  ‧ Summer Glau  ‧ James Earl Jones  ‧ Carrie Fisher  ‧ Brent Spiner  ‧ Bill Nye  ‧ George Smoot  ‧ George Takei  ‧ LeVar Burton  ‧ Neil deGrasse Tyson  ‧ Brian Greene  ‧ Charlie Sheen  ‧ Stan Lee
Crew Writers Chuck Lorre * (Creator)  ‧  Bill Prady * (Creator)  ‧  Steven Molaro *  ‧  Steve Holland *  ‧  Maria Ferrari *  ‧  Jim Reynolds *  ‧  Eric Kaplan *  ‧  Anthony Del Broccolo  ‧  Lee Aronsohn *  ‧  Dave Goetsch *  ‧  Tara Hernandez  ‧  Richard Rosenstock *
Directors Mark Cendrowski  ‧  Peter Chakos * (mainly as Editor)  ‧  Anthony Rich  ‧  James Burrows
Science consultant : David Saltzberg Director of photography : Steven V. Silver
Costume designer : Mary T. Quigley * Unit production manager : Kelly-Anne Lee *
Theme composer / performer : Barenaked Ladies Chuck Lorre Productions
also as Producer The Big Bang Theory : Full cast & crew on IMDb

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