Jason Alexander (born "Jay Greenspan",
September 23,
1959, in
Newark, New Jersey) was one of the stars of the award-winning television
sitcom "
Seinfeld". His character, the neurotic ne'er-do-well George Costanza,
Jerry Seinfeld's best friend, was based in part on the show's creator,
Larry David. He has also appeared in a number of movies, and done some work as a director.
More details are available here: http://uk.imdb.com/Name?Alexander,+Jason