
Acting
Jay Scott Greenspan (born September 23, 1959), better known by his professional name of Jason Alexander, is an American actor, writer, comedian, television director and producer, and singer. He is best known for his role as George Costanza on the television series Seinfeld, appearing in the sitcom from 1989 to 1998. He also has had an active career on the stage, appearing in several Broadway musicals including Jerome Robbins' Broadway in 1989, for which he won the Tony Award as Best Actor in a Musical. He appeared in the Los Angeles production of The Producers with Martin Short. He is the Artistic Director of "Reprise! Broadway's Best in Los Angeles," where he has directed several musicals. Alexander is also an avid poker player.

The Simpsons
1989

Criminal Minds
2005

American Dad!
2005

Jeopardy!
1984

The Late Show with Stephen Colbert
2015

Late Night with Seth Meyers
2014

Friends
1994

Saturday Night Live
1975

Two and a Half Men
2003

Young Sheldon
2017

Hollywood Squares
1998

The Late Late Show with James Corden
2015

Real Time with Bill Maher
2003

Monk
2002

Seinfeld
1989

The Late Late Show with Craig Ferguson
2005

Golden Globe Awards
1944

Malcolm in the Middle
2000

Jimmy Kimmel Live!
2003

The Nanny
1993

Curb Your Enthusiasm
2000

Star Trek: Voyager
1995

Robot Chicken
2005

Tony Awards
1956

LIVE with Kelly and Mark
1988

Community
2009

The Tom and Jerry Show
2014

Good Day Live
2001

Newhart
1982

The Ellen DeGeneres Show
2003

Harley Quinn
2019

The $100,000 Pyramid
2016

Late Night with David Letterman
1982

The Orville
2017

The Marvelous Mrs. Maisel
2017

The Cleveland Show
2009