Johnny Galecki. He is known for playing David Healy in the ABC sitcom Roseanne from 1992 - 1997 and Dr. Leonard Hofstadter in the CBS sitcom The Big Bang Theory since 2007.
Johnny Galecki's character in The Big Bang Theory had a doctoral degree.
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Johnny Galecki's character in The Big Bang Theory had a doctoral degree.
Create a short claim.
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Johnny Galecki's character in The Big Bang Theory had a doctoral degree.
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