Johnny Galecki

ActorProducer Apr 30 (age 50) Bree, Belgium 1975–2025 (50 year career)

6.0 avg rating

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.

Known For

Film

The Big Bang Theory

Leonard Hofstadter

Film

In Time

Borel

Film

A Dog's Journey

Henry Montgomery

Film

Hancock

Jeremy

Film

Vanilla Sky

Peter Brown

Film

National Lampoon's Christmas Vacation

Rusty Griswold

Film

Bean

Stingo Wheelie

Film

I Know What You Did Last Summer

Max Neurick

Filmography

Acting (58)

Movies (31)

I'm Chevy Chase and You're Not

2025

as Self

7.1

The Little Dog Laughed

2020

as Alex

A Dog's Journey

2019

as Henry Montgomery

8.1

Unraveling The Mystery: A Big Bang Farewell

2019

as Self - Host

The Cleanse

as Paul Berger

Rings

as Gabriel Brown

Must See TV: An All Star Tribute to James Burrows

as Self

CBGB

as Terry Ork

In Time

as Borel

Table for Three

as Ted

Hancock

as Jeremy

Happy Endings

as Miles (uncredited)

Chrystal

as Barry

Bookies

as Jude

Vanilla Sky

as Peter Brown

Morgan's Ferry

as Darcy

Bounce

as Seth

Playing Mona Lisa

as Arthur

The Opposite of Sex

as Jason Bock

Bean

as Stingo Wheelie

I Know What You Did Last Summer

as Max Neurick

Suicide Kings

as Ira Reder

Murder at My Door

as Teddy McNair

Without Consent

as Marty

Sudden Fury

as Daniel Hannigan

Backfield in Motion

as Tim Seavers

In Defense of a Married Man

1990

as Eric

4.5

National Lampoon's Christmas Vacation

as Rusty Griswold

Prancer

as Billy Quinn

A Night in the Life of Jimmy Reardon

as Toby Reardon

Murder Ordained

as Doug Rule

Television (27)

Stars in the House

2020

as Self

The Conners

2018

as David Healy

7.1

SciJinks

2018

as Himself - Host

The Late Show with Stephen Colbert

as Self - Guest

Lip Sync Battle

as Self

Peep Show

as Mark

Conan

2010

as Self

7.2

The Big Bang Theory

2007

as Leonard Hofstadter

7.9

Boulevard of Broken Dreams

2007

as Self (archive footage)

3.0

American Dad!

2005

as Arnie (voice)

7.0

The Late Late Show with Craig Ferguson

as Self

My Name Is Earl

as Scott

Entourage

as Johnny Galecki

LAX

as Leland Pressman

Hope & Faith

as Jay

Family Guy

as Leonard Hofstadter (voice)

Batman Beyond

as Knux (voice)

The Norm Show

as Dale Stackhouse

Billy

as David MacGregor

Civil Wars

as Greg Stolbach

Blossom

as Jason

American Dreamer

as Danny Nash

Blind Faith

as John Marshall

Hardball

Roseanne

as David Healy

Entertainment Tonight

1981

as Self

4.1

People's Choice Awards

1975

as Self - Presenter

9.0

Crew (2)

Movies (1)

The Cleanse

2018

Producer

5.1

Television (1)

SciJinks

2018

Executive Producer