Jason Alexander
Known for: 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.
Filmography
Series
Monk
Marty Eels
2002
Series
Seinfeld
George Costanza
1989
Series
The Simpsons
Bourbon Verlander (voice)
1989
Series
Criminal Minds
Prof. Rothchild
2005
Series
Friends
Earl
1994
Series
Late Night with Seth Meyers
Self - Guest
2014
Series
The Late Show with Stephen Colbert
Self - Guest
2015
Series
American Dad!
Mr. Orlando (voice)
2005
Series
American Dad!
Sal (voice)
2005
Series
The Late Late Show with Craig Ferguson
Self
2005
Series
Saturday Night Live
Self - Host
1975
Series
Saturday Night Live
Titey (voice)
1975
Series
Saturday Night Live
Self (uncredited)
1975
Series
Real Time with Bill Maher
Self
2003
Series
Hollywood Squares
Self - Panelist
1998
Series
The Late Late Show with James Corden
Self
2015
Series
Jeopardy!
Self
1984
Series
Jeopardy!
Self - Clue Presenter
1984
Series
Two and a Half Men
Dr. Goodman
2003
Series
Jimmy Kimmel Live!
Self
2003
Series
LIVE with Kelly and Mark
Self - Guest
1988
Series
Young Sheldon
Gene Lundy
2017
Series
Star Trek: Voyager
Kurros
1995
Series
Late Night with David Letterman
Self
1982
Series
The Tom and Jerry Show
Rick (voice)
2014
Series
Malcolm in the Middle
Leonard
2000
Series
Curb Your Enthusiasm
Jason Alexander
2000
Series
The Nanny
Jack
1993
Series
The Ellen DeGeneres Show
Self
2003
Series
Robot Chicken
Krampus (voice)
2005
Series
Good Day Live
Self
2001
Series
Tony Awards
Self - Presenter
1956
Series
Community
Mountain Man
2009
Series
Golden Globe Awards
Self - Nominee
1944
Series
Rock, Paper, Scissors
Jonathan Fartjoke (voice)
2024
Series
The Orville
Olix
2017
Series
Newhart
1982
Series
Newhart
Ramming
1982
Series
Dinosaurs
Grown Baby (voice)
1991
Series
Dinosaurs
Stu (voice)
1991
Series
Dinosaurs
Gus Molehill (voice)
1991
Series
Dinosaurs
The Job Wizard (voice)
1991
Series
Dinosaurs
General H. Norman Conquest (voice)
1991
Series
Dinosaurs
Sexual Harris (voice)
1991
Series
Dinosaurs
UFO! Host / Announcer (voice)
1991
Series
Harley Quinn
Sy Borgman (voice)
2019
Series
Everybody Hates Chris
Principal Edwards
2005
The Tony Danza Show
Self - Guest
2004
Series
The Marvelous Mrs. Maisel
Asher Friedman
2017
Series
Stars in the House
Self
2020
Series
Stars in the House
Self - Special Guest
2020
Series
The Larry Sanders Show
Jason Alexander
1992
Series
The Cleveland Show
2009
Series
Fish Hooks
Mr. Nibbles
2010
Series
Fish Hooks
Mr. Nibbles (voice)
2010
Series
Hercules
Poseidon
1998
Series
Hercules
Poseidon (voice)
1998
Series
The Conners
Pastor Phil
2018
Series
The New Adventures of Old Christine
Dr. Palmer
2006
Series
Aladdin
Abis Mal (voice)
1994
Series
Aladdin
Captain Albatross (voice)
1994
Series
Aladdin
Abis Mal / Abnor Mal (voice)
1994
Series
Duckman
Duckman (voice)
1994
Series
Comedy Bang! Bang!
Inspector Gantlet
2012
Series
Franklin & Bash
Carter Lang
2011
Series
The $100,000 Pyramid
Self
2016
Series
The Twilight Zone
Patient
2002
Series
Talking Dead
Self
2011
Series
Reading Rainbow
Self - Narrator (voice)
1983
Series
Comedians in Cars Getting Coffee
Self
2012
Series
Disney's House of Mouse
2001
Series
To Tell the Truth
Self - Panelist
2016
Series
Drunk History
William Tweed
2013
Series
The Late Late Show with Craig Kilborn
Self - Guest
1999
Series
Star Trek: Prodigy
Doctor Noum (voice)
2021
Series
Star Trek: Prodigy
Counselor Noum (voice)
2021
Series
Match Game
Self - Panelist
2016
Series
Rachael Ray
Self - Guest
2006
Series
Celebrity Wheel of Fortune
Self - Contestant
2021
Series
Dream On
Randall Townsend
1990
Series
Harry's Law
Richard Cross
2011
Series
Penn Zero: Part-Time Hero
Coach Wallace (voice)
2014
Series
People's Choice Awards
Self - Host
1975
Series
The Legend of Tarzan
Zutho (voice)
2001
Film
Jimmy
Louis B. Mayer
2026
Series
Hollywood Game Night
Self
2013
Series
The Bad Guys: The Series
Mysterious Figure (voice)
2025
Series
The Bad Guys: The Series
D.B. Cougar (voice)
2025
Series
Who Wants to Be a Millionaire
Self - Contestant
2020
Series
Son of the Beach
2000
Film
Pretty Woman
Philip Stuckey
1990
Series
History of the World: Part II
Maurice Cheeks
2023
Series
Dilbert
Catbert (voice)
1999
Series
Remember WENN
Alan Ballinger
1996
Series
China, IL
Harold (voice)
2011
Film
The Hunchback of Notre Dame
Gargoyle Hugo (voice)
1996
Film
Hachi: A Dog's Tale
Carl
2009
Series
Mating Season
Alan (voice)
2026
Series
Muppets Tonight
Self
1996
Series
The Huntress
2000
Series
The Grinder
Cliff Bemis
2015
Series
The Movies That Made Us
Self
2019
Series
The Problem with Jon Stewart
Jeff Bezos
2021
Series
TripTank
Doctor (voice)
2014
The Marriage Ref
Self - Panelist
2010
Series
Primetime Glick
2001
Film
Wild Card
Pinky
2015
Film
The Electric State
Ted / Wingman
2025
Series
Critics Choice Awards
Self
2001
Series
Shatner's Raw Nerve
Self
2008
Series
Talkshow with Spike Feresten
2006
Film
Jacob's Ladder
Geary
1990
Film
The Return of Jafar
Abis Mal (voice)
1994
Series
E/R
Harold Stickley
1984
Series
E/R
1984
Series
Listen Up!
Tony Kleinman
2004
Film
Shallow Hal
Mauricio Wilson
2001
Series
A Capitol Fourth
Self
1980
Series
Mad About You
Jason Alexander
2019
Film
Leo
Jayda's Dad (voice)
2023
Series
Kirstie
Stanford Temple
2013
Series
The Emmy Awards
Self
1949
Film
The Hunchback of Notre Dame II
Gargoyle Hugo (voice)
2002
Series
LEGO Marvel Avengers: Strange Tails
Magneto (voice)
2025
Film
101 Dalmatians II: Patch's London Adventure
Lightning (voice)
2003
Film
Coneheads
Larry Farber
1993
Series
Big Time in Hollywood, Fl
Jason Alexander
2015
Series
Meteor
Dr. Chetwyn
2009
Series
History of the Sitcom
Self - Actor
2021
Series
Bob Patterson
Bob Patterson
2001
Series
Kody Kapow
Goji (voice)
2017
Series
Thank God You're Here
Self
2007
Series
Favorite Son
Chris Van Allen
1988
Series
Everything's Relative
Julian Beeby
1987
Film
The Burning
Dave
1981
Film
The Adventures of Rocky & Bullwinkle
Boris
2000
Series
Dinner with Dad
Jason Alexander
2017
Film
The Mosquito Coast
Hardware Clerk
1986
Film
Blankman
Mr. Stone
1994
Film
White Palace
Neil
1990
Film
Tom and Jerry: Back to Oz
Mr. Bibb / The Nome King (voice)
2016
Film
North
North's Dad
1994
Series
Hit the Road
Ken Swallow
2017
Series
Y llegaron de noche
Carl Laemmle
2024
Film
A Fairly Odd Movie: Grow Up, Timmy Turner!
Cosmo
2011
Film
Dunston Checks In
Robert Grant
1996
Film
Leo 2
Film
The Paper
Marion Sandusky
1994
Where My Dogs At?
2006
Film
Madeline: Lost in Paris
Uncle Horst / Henri (voice)
1999
Film
For the Love of Spock
Self
2016
Step It Up and Dance
2008
Film
The Last Supper
Anti-Enviroment
1995
Film
To Kill a Nazi
Narrator
2026
Film
Cinderella
Lionel
1997
Series
Saturday TV Funhouse
Titey (voice)
Film
Killing Me Softly with His Songs
Self
2022
Film
The Grand
Dr. Yakov Achmed
2007
Film
The Gettysburg Address
Noah Brooks (voice)
2025
Film
Larry Gaye: Renegade Male Flight Attendant
Larry's Dad
2015
Film
Love! Valour! Compassion!
Buzz Hauser
1997
Film
The Aristocrats
Self
2005
Film
The Trumpet of the Swan
Father (voice)
2001
Film
Best Worst Thing That Ever Could Have Happened...
Self
2016
Film
Broadway: Beyond the Golden Age
Self
2021
Film
Farce of the Penguins
Penguin on Belly (voice)
2006
Film
Dick Van Dyke: 98 Years of Magic
Self - Performer
2023
Film
Broadway: The Next Generation
Self
Film
Snoop Dogg's Hood of Horror
British Record Mogul
2006
Film
Sideshow: Alive on the Inside
Narrator
1999
Film
Quantum Quest: A Cassini Space Odyssey
Moronic (voice)
2010
Film
Not Your Time
Sid Rosenthal
2010
Film
Let's Rap Fire Safety
Seemore Smoke (voice)
2000
Film
Larry David: Curb Your Enthusiasm
Self
1999
Film
Bravo Profiles: Penn and Teller
Self
2001
Film
Brighton Beach Memoirs
Pool Player #1
1986
Film
Misery Loves Comedy
Self
2015
Film
How Murray Saved Christmas
Doc Holiday (voice)
2014
Film
The Last Laugh
Self (archive footage) (uncredited)
2016
Film
The Truth Is in the Stars
Self
2017
Film
For Better or Worse
Michael Makeshift
1995
Film
National Lampoon's Another Dirty Movie
Self (uncredited)
2012
Film
Kramer vs. Kramer: Kenny to Cosmo
Self
2004
Film
Love and Action in Chicago
Frank Bonner
1999
Film
Comedy Central Roast of William Shatner
Self - Roastmaster
2006
Film
The Making of Disney's The Hunchback of Notre Dame
1996
Film
Dunston Checks Out
Jason Alexander (archival footage)
2022
Film
My Boyfriend's Meds
Dr. Sternbach
2020
Film
Jerry Seinfeld: Submarine Captain
Self
2007
Film
A Christmas Carol
Jacob Marley / Marley's Ghost
2004
Film
Seinfeld: How It Began
Self/George Costanza
2004
Film
Faith Based
Nicky Steele
2020
Film
Cinderella: The Reunion, A Special Edition of 20/20
Self
2022
Film
Ira & Abby
Dr. Morris Saperstein
2006
Film
The Man Who Saved Christmas
A.C. Gilbert
2002
Film
The N.Y. Friars Club Roast of Jerry Stiller
Self - Roastmaster
1999
Film
The Voyages of Young Doctor Dolittle
Eugene (voice)
2011
Film
Paddy Chayefsky: Collector of Words
Self
2025
Film
Denial
Art Witz
1998
Film
Earth to America
self
2005
Film
Out of Office
2022
Film
Stars in Shorts
Sid Rosenthal
2012
Film
Rockabye
Lt. Ernest Foy
1986
Film
Jingle Bells
Elf (Voice)
1999
Film
There's Something About Romcoms
Self
2016
Film
On Edge
Zamboni Phil
2001
Say It Ain't Solo
Self
2012
Film
Bye Bye Birdie
Albert J. Peterson
1995
Film
China, Il The Musical
Harold
2015
Film
For Goodness Sake
Electronics Store Customer
1993
Film
Rock Slyde
Mailman Stan
2010
Film
The Very Best of America's Funniest Comedians
Self (archive footage)
2003
Film
Bucky and the Squirrels
Jason Alexander
2018
Film
Stealing Pulp Fiction
Dr. Mendelbaum
2025
Film
How to Go Out on a Date in Queens
Johnny
2006
Film
Senior Trip
Pete
1981
Film
A Tribute to Stephen Sondheim
1995
Film
Lucky Stiff
Vinnie Di Ruzzio
2014
Film
Down on the Waterfront
1994
Film
The Rocky Horror Musical Live Stream
Narrator
2020
Film
Dora the Explorer: Dora's Enchanted Forest Adventures
Owl (voice)
2011
Film
I Don't Buy Kisses Anymore
Bernie Fishbine
1992
Film
The Mark Lembeck Technique
Mark Lembeck
2016
Film
The Seinfeld Story
Self
2004
Film
Titey
Titey (voice)
1998
Film
The Conspiracy
2022
Film
Being 'Shallow Hal'
Self
2001
Film
The Portuguese Kid
Barry Dragonetti
2018
Film
Ultimate Trek: Star Trek's Greatest Moments
Host
1999
Film
Sexual Healing
Frank
1993
Film
The Sisters Rosensweig
Mervyn
Doom Scroll