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Jason Scott Greenspan (born September 23, 1959, in
Newark, New Jersey), television, cinema and
musical theatre actor, was one of the stars of the
award-winning television situation comedy|sitcom
Seinfeld in which he played the neurotic
ne'er-do-well George Costanza, Jerry Seinfeld's
best friend. He has also appeared in a number of
movies (Love! Valour! Compassion! among them) and
done some work as a director, including a recent
successful Hollywood concert version of the
musical Hair (musical)|Hair, for which he was also
the emcee. He is also known for providing the
voice of the lead character in the cult animated
series Duckman.

Alexander began his acting career on the New York
stage. On Broadway, he appeared in Stephen
Sondheim's Merrily We Roll Along, The Rink, Neil
Simon's Broadway Bound, Accomplice, and Jerome
Robbins' Broadway, for which he was awarded the
1989 Tony Award for Best Actor in a Musical. 

Alexander has also done a McDonalds commercial
advertising the McDLT, in which he sings. He has
also appeared in KFC commercials, including one
with baseball superstar Barry Bonds of the San
Francisco Giants and another one opposite Trista
Rehn of The Bachelorette.  He is also featured in
country star Brad Paisley's music video,
"Celebrity".  Currently, he appears in ads for
DaimlerChrysler vehicles, which is coincidental,
considering the fact that George Costanza once
bought a Chrysler convertible solely on the belief
that it was previously owned by Jon Voight (the
actual owner was John Voight, a New York dentist).

In the fall of 2004, he began appearing in a new
show on CBS, Listen Up, costarring Malcolm-Jamal
Warner. His character is based on sportswriter
Tony Kornheiser.

Alexander also appeared with Kelsey Grammer in the
musical adaptation of Charles Dickens' A Christmas
Carol.  He played Jacob Marley to Grammer's
Ebenezer Scrooge.

Alexander appears on the Family Guy: Live in Vegas
CD singing a verse in the song "All Cartoons are
F****** D***".

==External links==
*http://www.imdb.com/Name?Alexander,+Jason Jason
Alexander's entry on the Internet Movie Database