Johnny Galecki

Biography

Johnny Galecki is a Belgian-born American actor, best known for his roles as David Healy in Roseanne, Rusty Griswold in National Lampoon's Christmas Vacation, and as Leonard Hofstadter in The Big Bang Theory.

Career Overview

Johnny Galecki has 44 screen credits in a career dating back to 1987. Their work spans 7 cinematic universes — most prominently A Dog's Purpose Collection with 1 titles. Signature works include The Big Bang Theory, In Time, National Lampoon's Christmas Vacation. Explore the interactive character relationship maps on each title page to trace how their roles connect across franchises.

Personal Facts

Known For

Acting

Gender

male

Known Credits

44

Birth Date

1975-04-30 00:00:00

Birth Place

Bree, Belgium

Known For

• 

  The Big Bang Theory
• 

  In Time
• 

  National Lampoon's Christmas Vacation
• 

  Rings
• 

  I Know What You Did Last Summer
• 

  The Cleanse

Associated Universes

Universe traveler — spans 7 universes

• A Dog's Purpose Collection (1 titles)
• The Ring (1 titles)
• I Know What You Did Last Summer (1 titles)
• Mr. Bean (1 titles)
• National Lampoon Vacation (1 titles)
• National Lampoon's Vacation Collection (1 titles)
• Prancer Collection (1 titles)

Frequent Collaborators

• Jim Parsons (1 collaborations)
• Kaley Cuoco (1 collaborations)
• Simon Helberg (1 collaborations)
• Kunal Nayyar (1 collaborations)
• Melissa Rauch (1 collaborations)
• Mayim Bialik (1 collaborations)
• Justin Timberlake (1 collaborations)
• Amanda Seyfried (1 collaborations)
• Cillian Murphy (1 collaborations)
• Olivia Wilde (1 collaborations)

Credits

• actors (43 credits)

  • I'm Chevy Chase and You're Not

    Self

    actor

    actors
    2025
  • The Little Dog Laughed

    Alex

    actor

    actors
    2020
  • Unraveling the Mystery: A Big Bang Farewell

    Self - Host

    actor

    actors
    2019
  • A Dog's Journey

    Henry Montgomery

    actor

    actors
    2019
  • The Cleanse

    Paul Berger

    actor

    actors
    2018
  • The Conners

    - Lanford... Lanford (2019) ... David Healy actor actors

    - A Kiss Is Just a Kiss (2019) ... David Healy actor actors

    - We Continue to Truck (2019) ... David Healy actor actors

    - Tangled Up in Blue (2018) ... David Healy actor actors
    2018
  • Rings

    Gabriel Brown

    actor

    actors
    2017
  • Must See TV: An All Star Tribute to James Burrows

    Self

    actor

    actors
    2016
  • The Late Show with Stephen Colbert

    - The Cast of The Big Bang Theory, Barenaked Ladies (2019) ... Self - Guest actor actors
    2015
  • CBGB

    Terry Ork

    actor

    actors
    2013
  • In Time

    Borel

    actor

    actors
    2011
  • Conan

    - Johnny Galecki, Jim Parsons, Kaley Cuoco, Simon Helberg, Kunal Nayyar, Mayim Bialik, Melissa Rauch (2016) ... Self - Guest actor actors

    - Manuary 5th - The Day of the Dude (2012) ... Self actor actors
    2010
  • Table for Three

    Ted

    actor

    actors
    2009
  • Hancock

    Jeremy

    actor

    actors
    2008
  • The Big Bang Theory

    Leonard Hofstadter

    actor

    actors

    - Unraveling the Mystery: A Big Bang Farewell (2019) ... Leonard Hofstadter actor actors

    - The Change Constant / The Stockholm Syndrome (2019) ... Leonard Hofstadter actor actors

    - The Maternal Conclusion (2019) ... Leonard Hofstadter actor actors

    - The Plagiarism Schism (2019) ... Leonard Hofstadter actor actors

    - The Decision Reverberation (2019) ... Leonard Hofstadter actor actors
    2007
  • Happy Endings

    Miles (uncredited)

    actor

    actors
    2005
  • The Late Late Show with Craig Ferguson

    - Jason Segel / Johnny Galecki (2011) ... Self actor actors
    2005
  • American Dad!

    - Irregarding Steve (2006) ... Arnie (voice) actor actors
    2005
  • My Name Is Earl

    - Stole Beer From a Golfer (2005) ... Scott actor actors
    2005
  • Chrystal

    Barry

    actor

    actors
    2004
  • Entourage

    - Second to Last (2011) ... Johnny Galecki actor actors

    - The Big Bang (2011) ... Johnny Galecki actor actors

    - Home Sweet Home (2011) ... Johnny Galecki actor actors
    2004
  • Bookies

    Jude

    actor

    actors
    2003
  • Vanilla Sky

    Peter Brown

    actor

    actors
    2001
  • Morgan's Ferry

    Darcy

    actor

    actors
    2001
  • Bounce

    Seth

    actor

    actors
    2000
  • Playing Mona Lisa

    Arthur

    actor

    actors
    2000
  • Family Guy

    - Business Guy (2009) ... Leonard Hofstadter (voice) actor actors
    1999
  • Batman Beyond

    - April Moon (2000) ... Knux (voice) actor actors
    1999
  • The Opposite of Sex

    Jason Bock

    actor

    actors
    1998
  • I Know What You Did Last Summer

    Max Neurick

    actor

    actors
    1997
  • Suicide Kings

    Ira Reder

    actor

    actors
    1997
  • Bean

    Stingo Wheelie

    actor

    actors
    1997
  • Murder at My Door

    Teddy McNair

    actor

    actors
    1996
  • Without Consent

    Marty

    actor

    actors
    1994
  • Sudden Fury

    Daniel Hannigan

    actor

    actors
    1993
  • Backfield in Motion

    Tim Seavers

    actor

    actors
    1991
  • In Defense of a Married Man

    Eric

    actor

    actors
    1990
  • Blossom

    - Sex, Lies and Teenagers (1991) ... Jason actor actors
    1990
  • National Lampoon's Christmas Vacation

    Rusty Griswold

    actor

    actors
    1989
  • Prancer

    Billy Quinn

    actor

    actors
    1989
  • A Night in the Life of Jimmy Reardon

    Toby Reardon

    actor

    actors
    1988
  • Roseanne

    - Darlene v. David (2018) ... David Healy actor actors

    - Into That Good Night (1) (1997) ... David Healy actor actors

    - The Miracle (1997) ... David Healy actor actors

    - The War Room (1997) ... David Healy actor actors

    - Say It Ain't So (1997) ... David Healy actor actors
    1988
  • Murder Ordained

    Doug Rule

    actor

    actors
    1987

• production (1 credits)

  • The Cleanse

    producer

    production
    2018