Michael Richards is an American comedian and actor, who played Cosmo Kramer on the television show “Seinfeld”, a role which earned him three Emmy Awards.
By the mid-1990s, “Seinfeld” had become one of the most popular sitcoms in television history. The series ended its nine-year run in 1998 at #1 in the Nielsen Ratings. Richards and his fellow “Seinfeld” cast members have also provided interviews and audio commentaries for the “Seinfeld” DVDs.
Source - Wikipedia http://en.wikipedia.org/wiki/Michael_Richards