Johnny Galecki

1975 (51) • Acting

Born: 4/30/1975 (51) in Bree, Belgium

Known for: Acting

Johnny Galecki

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.

Known For

The Big Bang Theory

79%

Leonard Hofstadter

2007

In Time

70%

Borel

2011

Family Guy

74%

Leonard Hofstadter (voice)

1999

I Know What You Did Last Summer

60%

Max Neurick

1997

National Lampoon's Christmas Vacation

72%

Rusty Griswold

1989

Rings

50%

Gabriel Brown

2017

American Dad!

70%

Arnie (voice)

2005

My Name Is Earl

77%

Scott

2005

I'm Chevy Chase and You're Not

65%

Self

2025

The Little Dog Laughed

Alex

2020

Stars in the House

Self

2020

Unraveling the Mystery: A Big Bang Farewell

Self - Host

2019

A Dog's Journey

80%

Henry Montgomery

2019

The Conners

70%

David Healy

2018

SciJinks

70%

Himself - Host

2018

SciJinks

70%

Executive Producer

2018

The Cleanse

50%

Paul Berger

2018

The Cleanse

50%

Producer

2018

Rings

50%

Gabriel Brown

2017

Must See TV: An All Star Tribute to James Burrows

40%

Self

2016

Lip Sync Battle

64%

Self

2015

CBGB

64%

Terry Ork

2013

In Time

70%

Borel

2011

Conan

72%

Self

2010

Table for Three

46%

Ted

2009

Hancock

64%

Jeremy

2008

The Big Bang Theory

79%

Leonard Hofstadter

2007

Boulevard of Broken Dreams

30%

Self (archive footage)

2007

My Name Is Earl

77%

Scott

2005

American Dad!

70%

Arnie (voice)

2005

Happy Endings

56%

Miles (uncredited)

2005

The Late Late Show with Craig Ferguson

68%

Self

2005

LAX

73%

Leland Pressman

2004

Entourage

74%

Johnny Galecki

2004

Chrystal

56%

Barry

2004

Hope & Faith

54%

Jay

2003