Jerome Allen Seinfeld ( SYNE-feld; born April 29, 1954) is an American stand-up comedian, actor, writer, and producer. As a stand-up comedian, Seinfeld specializes in observational comedy. Seinfeld gained stardom playing a semi-fictionalized version of himself in the NBC sitcom Seinfeld (1989–1998), which he co-created and wrote with Larry David....
—Susan Cain in Quiet: The Power of Introverts