Who was the director of the 2000 mockumentary comedy film starring the actor who played Frank Costanza on the NBC sitcom "Seinfeld"?
The Independent (2000 film): The Independent is a mockumentary comedy film made in 2000, directed by Stephen Kessler and starring Jerry Stiller and Janeane Garofalo. Jerry Stiller:  He later played Frank Costanza on the NBC sitcom "Seinfeld" and Arthur Spooner on the CBS comedy series "The King of Queens".
Stephen Kessler