Jerome Seinfeld is an American comedian, actor, and writer. He is best known for playing a semi-fictional version of himself in the long-running sitcom “Seinfeld”, which he co-created and executively produced. “Seinfeld” became the most popular and successful sitcom on American television. He is also a bestselling author, most notably for his book “Seinlanguage”.
Source: Wikipedia http://en.wikipedia.org/wiki/Jerry_Seinfeld