Sep. 24, 2007
Returning Series
30 min.
CBS TV Network

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The Big Bang Theory

Leonard and Sheldon are brilliant physicists, the kind of "beautiful minds" that understand how the universe works. But none of that genius helps them interact with people, especially women. All this begins to change when a free-spirited beauty named Penny moves in next door.

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Leonard Hofstadter The Big Bang Theory
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Leonard Hofstadter

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  Played by:
Johnny GaleckiJohnny Galecki
John Mark "Johnny" Galecki (born April 30, 1975) is an American actor. He is best known for ...

Character Bio

Leonard Hofstadter photo
Name: Leonard Leakey Hofstadter, PhD.
Occupation: Experimental physicist.
IQ: 173.

Leonard Hofstadter is an experimental physicist at Caltech. He shares an apartment with Sheldon Cooper.

While Leonard, along with the other geeks, is somewhat socially inept, Leonard would like to be better accepted outside of his geeky social group. Leonard is more well-adjusted than his companions, being more willing to try different things.

Episode Screenshots

07x17 - The Friendship Turbulence
Season 7, Episode 17
04x20 - The Herb Garden Germination
Season 4, Episode 20
09x01 - The Matrimony Momentum
Season 9, Episode 01
05x10 - The Flaming Spittoon Acquisition
Season 5, Episode 10
[More Episodes]

Leonard Hofstadter Quotes

09x21 - The Viewing Party Combustion Season 9 / Episode 21: - The Viewing Party Combustion

Sheldon Cooper: A party sub implies it's a party.
Leonard Hofstadter: Your attendance implies that it's not.
Sheldon Cooper: I like a party as much as the next man. As long as the next man doesn't like a party.
09x18 - The Application Deterioration Season 9 / Episode 18: - The Application Deterioration

Penny Hofstadter: Hang on, what if Sheldon had no choice but to be respectful?
Leonard Hofstadter: Is there a switch on the back of his neck we don't know about?
[More Quotes]

Leonard Hofstadter Photos

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