Acting · Newark, New Jersey, USA · Born September 23, 1959
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.
MovieJimmy
2026
as Louis B. Mayer
TVMating Season
2026
as Alan (voice)
MovieThe Gettysburg Address
2025
as Noah Brooks (voice)
TVLEGO Marvel Avengers: Strange Tails
2025
as Magneto (voice)
TVThe Bad Guys: The Series
2025
as Mysterious Figure (voice)
MoviePaddy Chayefsky: Collector of Words
2025
as Self
MovieStealing Pulp Fiction
2025
as Dr. Mendelbaum
MovieThe Electric State
2025
as Ted / Wingman
TVY llegaron de noche
2024
as Carl Laemmle
TVRock, Paper, Scissors
2024
as Jonathan Fartjoke (voice)
MovieDick Van Dyke: 98 Years of Magic
2023
as Self - Performer
MovieLeo
2023
as Jayda's Dad (voice)
TVHistory of the World: Part II
2023
as Maurice Cheeks
MovieThe Conspiracy
2022
MovieKilling Me Softly with His Songs
2022
as Self
MovieOut of Office
2022
MovieCinderella: The Reunion, A Special Edition of 20/20
2022
as Self
MovieDunston Checks Out
2022
as Jason Alexander (archival footage)
TVStar Trek: Prodigy
2021
as Doctor Noum (voice)
TVThe Problem with Jon Stewart
2021
as Jeff Bezos
MovieBroadway: Beyond the Golden Age
2021
as Self
TVHistory of the Sitcom
2021
as Self - Actor
TVCelebrity Wheel of Fortune
2021
as Self - Contestant
MovieThe Rocky Horror Musical Live Stream
2020
as Narrator
MovieFaith Based
2020
as Nicky Steele
TVStars in the House
2020
as Self
MovieMy Boyfriend's Meds
2020
as Dr. Sternbach
TVThe Movies That Made Us
2019
as Self
TVHarley Quinn
2019
as Sy Borgman (voice)
TVMad About You
2019
as Jason Alexander
TVThe Conners
2018
as Pastor Phil
MovieThe Portuguese Kid
2018
as Barry Dragonetti
MovieBucky and the Squirrels
2018
as Jason Alexander
TVHit the Road
2017
as Ken Swallow
TVYoung Sheldon
2017
as Gene Lundy
TVThe Orville
2017
as Olix
TVKody Kapow
2017
as Goji (voice)
MovieThe Truth Is in the Stars
2017
as Self
TVThe Marvelous Mrs. Maisel
2017
as Asher Friedman
TVDinner with Dad
2017
as Jason Alexander
MovieThe Mark Lembeck Technique
2016
as Mark Lembeck
MovieBest Worst Thing That Ever Could Have Happened...
2016
as Self
MovieFor the Love of Spock
2016
as Self
MovieThere's Something About Romcoms
2016
as Self
TVThe $100,000 Pyramid
2016
as Self
TVMatch Game
2016
as Self - Panelist
MovieTom and Jerry: Back to Oz
2016
as Mr. Bibb / The Nome King (voice)
TVTo Tell the Truth
2016
as Self - Panelist
MovieThe Last Laugh
2016
as Self (archive footage) (uncredited)
TVThe Grinder
2015
as Cliff Bemis
TVThe Late Show with Stephen Colbert
2015
as Self - Guest
MovieChina, Il The Musical
2015
as Harold
MovieLarry Gaye: Renegade Male Flight Attendant
2015
as Larry's Dad
TVBig Time in Hollywood, Fl
2015
as Jason Alexander
TVThe Late Late Show with James Corden
2015
as Self
MovieMisery Loves Comedy
2015
as Self
MovieWild Card
2015
as Pinky
MovieHow Murray Saved Christmas
2014
as Doc Holiday (voice)
TVPenn Zero: Part-Time Hero
2014
as Coach Wallace (voice)
MovieLucky Stiff
2014
as Vinnie Di Ruzzio
TVThe Tom and Jerry Show
2014
as Rick (voice)
TVTripTank
2014
as Doctor (voice)
TVLate Night with Seth Meyers
2014
as Self - Guest
TVKirstie
2013
as Stanford Temple
TVHollywood Game Night
2013
as Self
TVDrunk History
2013
as William Tweed
MovieStars in Shorts
2012
as Sid Rosenthal
TVComedians in Cars Getting Coffee
2012
as Self
TVComedy Bang! Bang!
2012
as Inspector Gantlet
MovieNational Lampoon's Another Dirty Movie
2012
as Self (uncredited)
Say It Ain't Solo
2012
as Self
MovieThe Voyages of Young Doctor Dolittle
2011
as Eugene (voice)
TVTalking Dead
2011
as Self
TVChina, IL
2011
as Harold (voice)
MovieDora the Explorer: Dora's Enchanted Forest Adventures
2011
as Owl (voice)
MovieA Fairly Odd Movie: Grow Up, Timmy Turner!
2011
as Cosmo
TVFranklin & Bash
2011
as Carter Lang
TVHarry's Law
2011
as Richard Cross
MovieNot Your Time
2010
as Sid Rosenthal
MovieQuantum Quest: A Cassini Space Odyssey
2010
as Moronic (voice)
TVFish Hooks
2010
as Mr. Nibbles
MovieRock Slyde
2010
as Mailman Stan
The Marriage Ref
2010
as Self - Panelist
TVThe Cleveland Show
2009
TVCommunity
2009
as Mountain Man
TVMeteor
2009
as Dr. Chetwyn
MovieHachi: A Dog's Tale
2009
as Carl
TVShatner's Raw Nerve
2008
as Self
Step It Up and Dance
2008
MovieJerry Seinfeld: Submarine Captain
2007
as Self
MovieThe Grand
2007
as Dr. Yakov Achmed
TVThank God You're Here
2007
as Self
MovieFarce of the Penguins
2006
as Penguin on Belly (voice)
TVRachael Ray
2006
as Self - Guest
TVTalkshow with Spike Feresten
2006
MovieComedy Central Roast of William Shatner
2006
as Self - Roastmaster
MovieHow to Go Out on a Date in Queens
2006
as Johnny
MovieSnoop Dogg's Hood of Horror
2006
as British Record Mogul
MovieIra & Abby
2006
as Dr. Morris Saperstein
Where My Dogs At?
2006
TVThe New Adventures of Old Christine
2006
as Dr. Palmer
MovieEarth to America
2005
as self
TVEverybody Hates Chris
2005
as Principal Edwards
TVCriminal Minds
2005
as Prof. Rothchild
MovieThe Aristocrats
2005
as Self
TVRobot Chicken
2005
as Krampus (voice)
TVAmerican Dad!
2005
as Mr. Orlando (voice)
TVThe Late Late Show with Craig Ferguson
2005
as Self
MovieA Christmas Carol
2004
as Jacob Marley / Marley's Ghost
MovieThe Seinfeld Story
2004
as Self
MovieSeinfeld: How It Began
2004
as Self/George Costanza
MovieKramer vs. Kramer: Kenny to Cosmo
2004
as Self
TVListen Up!
2004
as Tony Kleinman
The Tony Danza Show
2004
as Self - Guest
TVTwo and a Half Men
2003
as Dr. Goodman
TVThe Ellen DeGeneres Show
2003
as Self
MovieThe Very Best of America's Funniest Comedians
2003
as Self (archive footage)
Movie101 Dalmatians II: Patch's London Adventure
2003
as Lightning (voice)
TVReal Time with Bill Maher
2003
as Self
TVJimmy Kimmel Live!
2003
as Self
MovieThe Man Who Saved Christmas
2002
as A.C. Gilbert
TVThe Twilight Zone
2002
as Patient
TVMonk
2002
as Marty Eels
MovieThe Hunchback of Notre Dame II
2002
as Gargoyle Hugo (voice)
MovieBeing 'Shallow Hal'
2001
as Self
MovieShallow Hal
2001
as Mauricio Wilson
TVBob Patterson
2001
as Bob Patterson
Good Day Live
2001
as Self
TVThe Legend of Tarzan
2001
as Zutho (voice)
TVPrimetime Glick
2001
MovieOn Edge
2001
as Zamboni Phil
MovieThe Trumpet of the Swan
2001
as Father (voice)
MovieBravo Profiles: Penn and Teller
2001
as Self
TVCritics Choice Awards
2001
as Self
TVDisney's House of Mouse
2001
TVCurb Your Enthusiasm
2000
as Jason Alexander
TVThe Huntress
2000
MovieThe Adventures of Rocky & Bullwinkle
2000
as Boris
TVSon of the Beach
2000
MovieLet's Rap Fire Safety
2000
TVMalcolm in the Middle
2000
as Leonard
MovieUltimate Trek: Star Trek's Greatest Moments
1999
as Host
MovieThe N.Y. Friars Club Roast of Jerry Stiller
1999
as Self - Roastmaster
MovieLarry David: Curb Your Enthusiasm
1999
as Self
MovieLove and Action in Chicago
1999
as Frank Bonner
MovieMadeline: Lost in Paris
1999
as Uncle Horst / Henri (voice)
TVThe Late Late Show with Craig Kilborn
1999
as Self - Guest
MovieSideshow: Alive on the Inside
1999
as Narrator
TVDilbert
1999
as Catbert (voice)
MovieJingle Bells
1999
as Elf (Voice)
TVHollywood Squares
1998
as Self - Panelist
TVHercules
1998
as Poseidon
MovieDenial
1998
as Art Witz
MovieTitey
1998
as Titey (voice)
MovieCinderella
1997
as Lionel
MovieLove! Valour! Compassion!
1997
as Buzz Hauser
MovieThe Hunchback of Notre Dame
1996
as Gargoyle Hugo (voice)
MovieThe Making of Disney's The Hunchback of Notre Dame
1996
TVMuppets Tonight
1996
as Self
TVRemember WENN
1996
as Alan Ballinger
MovieDunston Checks In
1996
as Robert Grant
MovieBye Bye Birdie
1995
as Albert J. Peterson
MovieThe Last Supper
1995
as Anti-Enviroment
MovieFor Better or Worse
1995
as Michael Makeshift
TVStar Trek: Voyager
1995
as Kurros
MovieA Tribute to Stephen Sondheim
1995
MovieThe Return of Jafar
1994
as Abis Mal - the Chief of the Thieves (voice)
TVFriends
1994
as Earl
MovieBlankman
1994
as Mr. Stone
MovieNorth
1994
as North's Dad
MovieDown on the Waterfront
1994
MovieThe Paper
1994
as Marion Sandusky
TVDuckman
1994
as Duckman (voice)
TVAladdin
1994
as Abis Mal (voice)
TVThe Nanny
1993
as Jack
MovieConeheads
1993
as Larry Farber
MovieSexual Healing
1993
as Frank
MovieFor Goodness Sake
1993
as Electronics Store Customer
TVThe Larry Sanders Show
1992
as Jason Alexander
MovieI Don't Buy Kisses Anymore
1992
as Bernie Fishbine
TVDinosaurs
1991
as Grown Baby (voice)
MovieJacob's Ladder
1990
as Geary
MovieWhite Palace
1990
as Neil
TVDream On
1990
as Randall Townsend
MoviePretty Woman
1990
as Philip Stuckey
TVThe Simpsons
1989
as Bourbon Verlander (voice)
TVSeinfeld
1989
as George Costanza
TVFavorite Son
1988
as Chris Van Allen
TVLIVE with Kelly and Mark
1988
as Self - Guest
TVEverything's Relative
1987
as Julian Beeby
MovieBrighton Beach Memoirs
1986
as Pool Player #1
MovieThe Mosquito Coast
1986
as Hardware Clerk
MovieRockabye
1986
as Lt. Ernest Foy
TVE/R
1984
as Harold Stickley
TVJeopardy!
1984
as Self
TVReading Rainbow
1983
as Self - Narrator (voice)
TVNewhart
1982
TVLate Night with David Letterman
1982
as Self
MovieSenior Trip
1981
as Pete
MovieThe Burning
1981
as Dave
TVA Capitol Fourth
1980
as Self
TVSaturday Night Live
1975
as Self - Host
TVPeople's Choice Awards
1975
as Self - Host
TVTony Awards
1956
as Self - Presenter
TVThe Emmy Awards
1949
as Self
TVGolden Globe Awards
1944
as Self - Nominee
MovieBroadway: The Next Generation
as Self
MovieThe Sisters Rosensweig
as Mervyn
MovieLeo 2
TVSaturday TV Funhouse
as Titey (voice)
