Jay Scott Greenspan, 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.
Known For
The Gettysburg Address
Noah Brooks (voice)
2025
Paddy Chayefsky: Collector of Words
Self
2025
The Electric State
Ted / Wingman
2025
Stealing Pulp Fiction
Dr. Mendelbaum
2024
Dick Van Dyke: 98 Years of Magic
Self - Performer
2023
Leo
Jayda's Dad (voice)
2023
The Conspiracy
2022
Killing Me Softly with His Songs
Self
2022
Out of Office
2022
Cinderella: The Reunion, A Special Edition of 20/20
Self
2022
Dunston Checks Out
Jason Alexander (archival footage)
2022
Broadway: Beyond the Golden Age
Self
2021
The Rocky Horror Musical Live Stream
Narrator
2020
Faith Based
Nicky Steele
2020
My Boyfriend's Meds
Dr. Sternbach
2020
The Portuguese Kid
Barry Dragonetti
2018
Bucky and the Squirrels
Jason Alexander
2018
Broadway: The Next Generation
Self
2017
The Truth Is in the Stars
Self
2017
The Mark Lembeck Technique
Mark Lembeck
2016
Best Worst Thing That Ever Could Have Happened...
Self
2016
For the Love of Spock
Self
2016
There's Something About Romcoms
Self
2016
Tom and Jerry: Back to Oz
Mr. Bibb / The Nome King (voice)
2016
The Last Laugh
Self
2016
China, Il The Musical
Harold
2015
Larry Gaye: Renegade Male Flight Attendant
Larry's Dad
2015
Misery Loves Comedy
Self
2015
Wild Card
Pinky
2015
How Murray Saved Christmas
Doc Holiday (voice)
2014
Lucky Stiff
Vinnie Di Ruzzio
2014
Stars In Shorts
Sid Rosenthal
2012
National Lampoon's Another Dirty Movie
Self (uncredited)
2012
Say It Ain't Solo
Himself
2012
The Voyages of Young Doctor Dolittle
Eugene (voice)
2011
Dora the Explorer: Dora's Enchanted Forest Adventures
Owl (voice)
2011
A Fairly Odd Movie: Grow Up, Timmy Turner!
Cosmo
2011
Not Your Time
Sid Rosenthal
2010
Quantum Quest: A Cassini Space Odyssey
Moronic (voice)
2010
Rock Slyde
Mailman Stan
2010
Meteor
Dr. Chetwyn
2009
Hachi: A Dog's Tale
Carl
2009
Jerry Seinfeld: Submarine Captain
Himself
2007
The Grand
Dr. Yakov Achmed
2007
Farce of the Penguins
Penguin on Belly (voice)
2006
Talkshow with Spike Feresten
(1 episode)
2006
Comedy Central Roast of William Shatner
Self - Roastmaster
2006
How to Go Out on a Date in Queens
Johnny
2006
Snoop Dogg's Hood of Horror
British Record Mogul
2006
Ira & Abby
Dr. Morris Saperstein
2006
Earth to America
self
2005
Everybody Hates Chris
(2 episodes)
2005
The Aristocrats
Self
2005
A Christmas Carol
Jacob Marley / Marley's Ghost
2004
The Seinfeld Story
Self
2004
Seinfeld: How It Began
Self/George Costanza
2004
The Tony Danza Show
Self - Guest · (3 episodes)
2004
The Ellen DeGeneres Show
Self · (2 episodes)
2003
The Very Best of America's Funniest Comedians
Self (archive footage)
2003
101 Dalmatians II: Patch's London Adventure
Lightning (voice)
2003
The Man Who Saved Christmas
A.C. Gilbert
2002
The Hunchback of Notre Dame II
Gargoyle Hugo (voice)
2002
Being 'Shallow Hal'
Self
2001
Shallow Hal
Mauricio
2001
The Trumpet of the Swan
Father (voice)
2001
The Adventures of Rocky & Bullwinkle
Boris
2000
Son of the Beach
(1 episode)
2000
Let's Rap Fire Safety
2000
Ultimate Trek: Star Trek's Greatest Moments
Host
1999
The N.Y. Friars Club Roast of Jerry Stiller
Self - Roastmaster
1999
Larry David: Curb Your Enthusiasm
Self
1999
Love and Action in Chicago
Frank Bonner
1999
Madeline: Lost in Paris
Uncle Horst / Henri (voice)
1999
Sideshow: Alive on the Inside
Narrator
1999
Jingle Bells
Elf (Voice)
1999
Denial
Art Witz
1998
Titey
Titey (voice)
1998
Cinderella
Lionel
1997
Love! Valour! Compassion!
Buzz Hauser
1997
The Hunchback of Notre Dame
Gargoyle Hugo (voice)
1996
Dunston Checks In
Robert Grant
1996
Sex, Censorship and the Silver Screen
Quote Reader
1996
Bye Bye Birdie
Albert J. Peterson
1995
The Last Supper
Anti-Enviroment
1995
For Better or Worse
Michael Makeshift
1995
Blankman
Mr. Stone
1994
North
North's Dad
1994
The Return of Jafar
Abis Mal - the Chief of the Thieves (voice)
1994
Down on the Waterfront
1994
The Paper
Marion Sandusky
1994
Coneheads
Larry Farber
1993
Sexual Healing
Frank
1993
For Goodness Sake
Electronics Store Customer
1993
I Don't Buy Kisses Anymore
Bernie Fishbine
1992
Jacob's Ladder
Geary
1990
White Palace
Neil
1990
Dream On
Randall Townsend · (1 episode)
1990
Pretty Woman
Philip Stuckey
1990
Brighton Beach Memoirs
Pool Player #1
1986
The Mosquito Coast
Hardware Clerk
1986
Rockabye
Lt. Ernest Foy
1986
Senior Trip
Pete
1981
The Sisters Rosensweig
Mervyn
Leo 2
Y llegaron de noche
Carl Laemmle · (7 episodes)
2024
Rock, Paper, Scissors
Jonathan Fartjoke (voice) · (1 episode)
2024
History of the World: Part II
Maurice Cheeks · (1 episode)
2023
Star Trek: Prodigy
Doctor Noum (voice) · (7 episodes)
2021
Star Trek: Prodigy
Counselor Noum (voice) · (16 episodes)
2021
The Problem with Jon Stewart
Jeff Bezos · (1 episode)
2021
History of the Sitcom
Self - Actor · (8 episodes)
2021
Celebrity Wheel of Fortune
Self - Contestant · (1 episode)
2021
Stars in the House
Self · (1 episode)
2020
Stars in the House
Self - Special Guest · (1 episode)
2020
The Movies That Made Us
Self · (1 episode)
2019
Harley Quinn
Sy Borgman (voice) · (13 episodes)
2019
Mad About You
Jason Alexander · (1 episode)
2019
The Conners
Pastor Phil · (2 episodes)
2018
Hit the Road
Ken Swallow · (10 episodes)
2017
Young Sheldon
Gene Lundy · (5 episodes)
2017
The Orville
Olix · (2 episodes)
2017
Kody Kapow
Goji (voice) · (22 episodes)
2017
The Marvelous Mrs. Maisel
Asher Friedman · (1 episode)
2017
Dinner with Dad
Jason Alexander · (8 episodes)
2017
The $100,000 Pyramid
Self · (1 episode)
2016
Match Game
Self - Panelist · (6 episodes)
2016
To Tell the Truth
Self - Panelist · (2 episodes)
2016
The Grinder
Cliff Bemis · (4 episodes)
2015
Big Time in Hollywood, Fl
Jason Alexander · (1 episode)
2015
The Late Late Show with James Corden
Self · (1 episode)
2015
Penn Zero: Part-Time Hero
Coach Wallace (voice) · (1 episode)
2014
The Tom and Jerry Show
Rick (voice) · (52 episodes)
2014
TripTank
Doctor (voice) · (1 episode)
2014
Late Night with Seth Meyers
Self · (1 episode)
2014
Kirstie
Stanford Temple · (1 episode)
2013
Hollywood Game Night
Self · (2 episodes)
2013
Drunk History
William Tweed · (1 episode)
2013
Comedians in Cars Getting Coffee
Self · (1 episode)
2012
Comedy Bang! Bang!
Inspector Gantlet · (1 episode)
2012
Talking Dead
Self · (1 episode)
2011
China, IL
Harold (voice) · (10 episodes)
2011
Harry's Law
Richard Cross · (1 episode)
2011
Fish Hooks
Mr. Nibbles · (0 episode)
2010
Fish Hooks
Mr. Nibbles (voice) · (3 episodes)
2010
The Marriage Ref
Self - Panelist · (1 episode)
2010
The Cleveland Show
(1 episode)
2009
Community
Mountain Man · (1 episode)
2009
Meteor
Dr. Chetwyn · (2 episodes)
2009
Shatner's Raw Nerve
Self · (1 episode)
2008
Step It Up and Dance
(1 episode)
2008
Thank God You're Here
Self · (1 episode)
2007
Rachael Ray
Self - Guest · (1 episode)
2006
Where My Dogs At?
(1 episode)
2006
The New Adventures of Old Christine
Dr. Palmer · (1 episode)
2006
Criminal Minds
Prof. Rothchild · (1 episode)
2005
Robot Chicken
Krampus (voice) · (1 episode)
2005
American Dad!
Mr. Orlando (voice) · (1 episode)
2005
American Dad!
Sal (voice) · (1 episode)
2005
The Late Late Show with Craig Ferguson
Self · (1 episode)
2005
Listen Up!
Tony Kleinman · (22 episodes)
2004
Two and a Half Men
Dr. Goodman · (1 episode)
2003
Real Time with Bill Maher
Self · (8 episodes)
2003
Jimmy Kimmel Live!
(1 episode)
2003
The Twilight Zone
Patient · (1 episode)
2002
Monk
Marty Eels · (1 episode)
2002
Bob Patterson
Bob Patterson · (10 episodes)
2001
Good Day Live
Self · (1 episode)
2001
The Legend of Tarzan
Zutho (voice) · (1 episode)
2001
Primetime Glick
(1 episode)
2001
Critics Choice Awards
Self · (1 episode)
2001
Disney's House of Mouse
(0 episode)
2001
Curb Your Enthusiasm
Jason Alexander · (5 episodes)
2000
The Huntress
(1 episode)
2000
Malcolm in the Middle
Leonard · (1 episode)
2000
The Late Late Show with Craig Kilborn
Self - Guest · (1 episode)
1999
Dilbert
Catbert (voice) · (9 episodes)
1999
Hollywood Squares
Self - Panelist · (10 episodes)
1998
Hollywood Squares
(5 episodes)
1998
Hercules
Poseidon · (0 episode)
1998
Hercules
Poseidon (voice) · (5 episodes)
1998
Muppets Tonight
Self · (2 episodes)
1996
Remember WENN
Alan Ballinger · (1 episode)
1996
Star Trek: Voyager
Kurros · (1 episode)
1995
A Tribute to Stephen Sondheim
1995
Friends
Earl · (1 episode)
1994
Duckman
Duckman (voice) · (70 episodes)
1994
Aladdin
Abis Mal (voice) · (10 episodes)
1994
Aladdin
Captain Albatross (voice) · (1 episode)
1994
Aladdin
Abis Mal / Abnor Mal (voice) · (1 episode)
1994
The Larry Sanders Show
Jason Alexander · (1 episode)
1992
Dinosaurs
Grown Baby (voice) · (1 episode)
1991
Dinosaurs
Stu (voice) · (1 episode)
1991
Dinosaurs
The Job Wizard (voice) · (1 episode)
1991
Dinosaurs
Gus Molehill (voice) · (1 episode)
1991
Dinosaurs
Sexual Harris (voice) · (1 episode)
1991
Dinosaurs
General H. Norman Conquest (voice) · (1 episode)
1991
Dinosaurs
UFO! Host / Announcer (voice) · (1 episode)
1991
The Simpsons
Bourbon Verlander (voice) · (1 episode)
1989
Seinfeld
George Costanza · (180 episodes)
1989
Favorite Son
Chris Van Allen · (3 episodes)
1988
LIVE with Kelly and Mark
Self - Guest · (1 episode)
1988
Everything's Relative
Julian Beeby · (10 episodes)
1987
E/R
Harold Stickley · (6 episodes)
1984
E/R
(1 episode)
1984
Reading Rainbow
Himself - Narrator (voice) · (1 episode)
1983
Newhart
(1 episode)
1982
Late Night with David Letterman
Self · (1 episode)
1982
The Burning
Dave
1981
A Capitol Fourth
Self · (44 episodes)
1980
Saturday Night Live
Self - Host · (1 episode)
1975
Saturday Night Live
Self - Cameo (uncredited) · (1 episode)
1975
Tony Awards
Self - Presenter · (1 episode)
1956
The Emmy Awards
Self · (1 episode)
1949
Saturday TV Funhouse
Titey (voice) · (1 episode)