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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.

Jimmy
as Louis B. Mayer

Mating Season
as Alan (voice)

The Gettysburg Address
as Noah Brooks (voice)

LEGO Marvel Avengers: Strange Tails
as Magneto (voice)

The Bad Guys: The Series
as Mysterious Figure (voice)

Paddy Chayefsky: Collector of Words
as Self

Stealing Pulp Fiction
as Dr. Mendelbaum

The Electric State
as Ted / Wingman

Y llegaron de noche
as Carl Laemmle

Rock, Paper, Scissors
as Jonathan Fartjoke (voice)

Dick Van Dyke: 98 Years of Magic
as Self - Performer

Leo
as Jayda's Dad (voice)

History of the World: Part II
as Maurice Cheeks

The Conspiracy

Killing Me Softly with His Songs
as Self

Out of Office

Cinderella: The Reunion, A Special Edition of 20/20
as Self

Dunston Checks Out
as Jason Alexander (archival footage)

Star Trek: Prodigy
as Doctor Noum (voice)

The Problem with Jon Stewart
as Jeff Bezos

Broadway: Beyond the Golden Age
as Self

History of the Sitcom
as Self - Actor

Celebrity Wheel of Fortune
as Self - Contestant

The Rocky Horror Musical Live Stream
as Narrator

Faith Based
as Nicky Steele

Stars in the House
as Self

My Boyfriend's Meds
as Dr. Sternbach

The Movies That Made Us
as Self

Harley Quinn
as Sy Borgman (voice)

Mad About You
as Jason Alexander

The Conners
as Pastor Phil

The Portuguese Kid
as Barry Dragonetti

Bucky and the Squirrels
as Jason Alexander

Hit the Road
as Ken Swallow

Young Sheldon
as Gene Lundy

The Orville
as Olix

Kody Kapow
as Goji (voice)

The Truth Is in the Stars
as Self

The Marvelous Mrs. Maisel
as Asher Friedman

Dinner with Dad
as Jason Alexander

The Mark Lembeck Technique
as Mark Lembeck

Best Worst Thing That Ever Could Have Happened...
as Self

For the Love of Spock
as Self

There's Something About Romcoms
as Self

The $100,000 Pyramid
as Self

Match Game
as Self - Panelist

Tom and Jerry: Back to Oz
as Mr. Bibb / The Nome King (voice)

To Tell the Truth
as Self - Panelist

The Last Laugh
as Self (archive footage) (uncredited)

The Grinder
as Cliff Bemis

The Late Show with Stephen Colbert
as Self - Guest

China, Il The Musical
as Harold

Larry Gaye: Renegade Male Flight Attendant
as Larry's Dad

Big Time in Hollywood, Fl
as Jason Alexander

The Late Late Show with James Corden
as Self

Misery Loves Comedy
as Self

Wild Card
as Pinky

How Murray Saved Christmas
as Doc Holiday (voice)

Penn Zero: Part-Time Hero
as Coach Wallace (voice)

Lucky Stiff
as Vinnie Di Ruzzio