Jason Alexander (born Jason Scott Greenspan, September 23, 1959, in Newark, New Jersey), television, cinema and musical theatre actor, was one of the stars of the award-winning television 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! and Pretty Woman among them) and did some work as a director, including a recent successful Hollywood concert version of the 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 with Lee Iacocca 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, but that show did not last the entire season.

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.

Credit: en.wikipedia.org