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Fictional character
Leonard Hofstadter
The Big Bang Theory / Young Sheldon character
Johnny Galecki as Dr. Leonard Hofstadter
First appearance
"Pilot" (2007) (The Big Bang Theory)
Last appearance
"A Swedish Science Thing and the Equation for Toast" (2019) (Young Sheldon)
Created by
Chuck Lorre Bill Prady
Portrayed by
Johnny Galecki Isaac Harger (Young Sheldon)
In-universe information
Full name
Leonard Leakey Hofstadter
Gender
Male
Title
Doctor
Occupation
Experimental physicist
Family
Beverly Hofstadter (mother)
Alfred Hofstadter (father)
Michael Hofstadter (brother)
One or more niece and/or nephews via Michael
Unnamed sister
Nephews via sister:[1]
Neil
Jeffrey
Scott
William
Richard
Floyd (uncle)
Nancy (aunt)
Unnamed Child
Spouse
Penny
Relatives
Wyatt (father-in-law) Susan (mother-in-law)
Randall (brother-in-law) Lisa (sister-in-law)
Nationality
American
Leonard Leakey Hofstadter,[2][3] Ph.D., is a fictional character portrayed by Johnny Galecki in the CBS sitcom, The Big Bang Theory. Leonard is an experimental physicist who shares an apartment with colleague and best friend, Dr. Sheldon Cooper. For his portrayal, Galecki was nominated for a Primetime Emmy Award and a Golden Globe Award in 2011.
Penny is Leonard's next-door neighbor (across the hall) and main love interest, and the teasing of romance between the two of them is a major force driving the series. In season 9, "The Gorilla Dissolution", they get engaged[4] and married in Las Vegas.
^"The Procreation Calculation". The Big Bang Theory. Season 12. Episode 3. October 4, 2018. 12:16 minutes in. CBS.
^"The Middle-Earth Paradigm". The Big Bang Theory. Season 1. Episode 6. October 29, 2007. 05:16 minutes in. CBS.
^"The Big Bang Theory Leonard Hofstadter". the-big-bang-theory.com. Retrieved December 14, 2022.
^"The Gorilla Dissolution". The Big Bang Theory. Season 7. Episode 23. May 8, 2014.
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been to the International Space Station. Along with Sheldon Cooper, LeonardHofstadter, and Raj Koothrappali, Howard is part of the central cast of the show...
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characters in the show, alongside Howard Wolowitz, Sheldon Cooper, and LeonardHofstadter, to appear in every episode of The Big Bang Theory. Raj is based on...
of The Big Bang Theory, LeonardHofstadter compares Sheldon Cooper to an elephant seal pup who steals milk because Hofstadter feels Cooper is getting...
and Grey's Anatomy. Barber played Jimmy Speckerman, who bullied LeonardHofstadter at high school, in one episode of The Big Bang Theory. He was cast...
and aspiring actress who lives across the hall from physicists Dr. LeonardHofstadter and Dr. Sheldon Cooper. Prior to the 2010–2011 season, she earned...
Two of the main characters, Sheldon and Leonard, are named after actor, director, and producer Sheldon Leonard. Although this season received mixed reviews...
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wakes up from his coma, Johnny Galecki and Jim Parsons appear as LeonardHofstadter and Sheldon Cooper in the episode when Carter is forced by Peter to...
Obliteration, LeonardHofstadter mentions it to Penny after he does her essay for her. In The Bus Pants Utilization, Sheldon greets Leonard in the morning...
of his element. A mashup of Sesame Street and The Big Bang Theory; LeonardHofstadter and Sheldon Cooper are tired of their show, so they decide to teleport...
v t e The Big Bang Theory Characters LeonardHofstadter Sheldon Cooper Penny Howard Wolowitz Raj Koothrappali Amy Farrah Fowler Episodes Recurring concepts...
joke is told by Dr. LeonardHofstadter with the punchline mentioning "spherical chickens in a vacuum", in "The Cooper-Hofstadter Polarization" episode...
appearance on The Big Bang Theory, interviewing Dr. Sheldon Cooper and Dr. LeonardHofstadter on Science Friday about Cooper's failed discovery in "The Discovery...
Richard Hofstadter (August 6, 1916 – October 24, 1970) was an American historian and public intellectual of the mid-20th century. Hofstadter was the DeWitt...
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