Leonard Hofstadter

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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.