Jason Alexander

Biography

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.

Known For

The Simpsons

Criminal Minds

American Dad!

American Dad!

Late Night with Seth Meyers

The Late Show with Stephen Colbert

Friends

Seinfeld

All Movies (103)

• Jimmy2026 · as Louis B. Mayer
• The Gettysburg Address2025 · as Noah Brooks (voice)
• Paddy Chayefsky: Collector of Words2025 · as Self
• Stealing Pulp Fiction2025 · as Dr. Mendelbaum
• The Electric State2025 · as Ted / Wingman
• Dick Van Dyke: 98 Years of Magic2023 · as Self - Performer
• Leo2023 · as Jayda's Dad (voice)
• The Conspiracy2022
• Killing Me Softly with His Songs2022 · as Self
• Out of Office2022
• Cinderella: The Reunion, A Special Edition of 20/202022 · as Self
• Dunston Checks Out2022 · as Jason Alexander (archival footage)
• Broadway: Beyond the Golden Age2021 · as Self
• The Rocky Horror Musical Live Stream2020 · as Narrator
• Faith Based2020 · as Nicky Steele
• My Boyfriend's Meds2020 · as Dr. Sternbach
• The Portuguese Kid2018 · as Barry Dragonetti
• Bucky and the Squirrels2018 · as Jason Alexander
• The Truth Is in the Stars2017 · as Self
• The Mark Lembeck Technique2016 · as Mark Lembeck
• Best Worst Thing That Ever Could Have Happened...2016 · as Self
• For the Love of Spock2016 · as Self
• There's Something About Romcoms2016 · as Self
• Tom and Jerry: Back to Oz2016 · as Mr. Bibb / The Nome King (voice)
• The Last Laugh2016 · as Self (archive footage) (uncredited)
• China, Il The Musical2015 · as Harold
• Larry Gaye: Renegade Male Flight Attendant2015 · as Larry's Dad
• Misery Loves Comedy2015 · as Self
• Wild Card2015 · as Pinky
• How Murray Saved Christmas2014 · as Doc Holiday (voice)
• Lucky Stiff2014 · as Vinnie Di Ruzzio
• Stars in Shorts2012 · as Sid Rosenthal
• National Lampoon's Another Dirty Movie2012 · as Self (uncredited)
• Say It Ain't Solo2012 · as Self
• The Voyages of Young Doctor Dolittle2011 · as Eugene (voice)
• Dora the Explorer: Dora's Enchanted Forest Adventures2011 · as Owl (voice)
• A Fairly Odd Movie: Grow Up, Timmy Turner!2011 · as Cosmo
• Not Your Time2010 · as Sid Rosenthal
• Quantum Quest: A Cassini Space Odyssey2010 · as Moronic (voice)
• Rock Slyde2010 · as Mailman Stan
• Hachi: A Dog's Tale2009 · as Carl
• Jerry Seinfeld: Submarine Captain2007 · as Self
• The Grand2007 · as Dr. Yakov Achmed
• Farce of the Penguins2006 · as Penguin on Belly (voz)
• Comedy Central Roast of William Shatner2006 · as Self - Roastmaster
• How to Go Out on a Date in Queens2006 · as Johnny
• Snoop Dogg's Hood of Horror2006 · as British Record Mogul
• Ira & Abby2006 · as Dr. Morris Saperstein
• Earth to America2005 · as self
• The Aristocrats2005 · as Self
• A Christmas Carol2004 · as Jacob Marley / Marley's Ghost
• The Seinfeld Story2004 · as Self
• Seinfeld: How It Began2004 · as Self/George Costanza
• Kramer vs. Kramer: Kenny to Cosmo2004 · as Self
• The Very Best of America's Funniest Comedians2003 · as Self (archive footage)
• 101 Dalmatians II: Patch's London Adventure2003 · as Lightning (voice)
• The Man Who Saved Christmas2002 · as A.C. Gilbert
• The Hunchback of Notre Dame II2002 · as Gargoyle Hugo (voice)
• Being 'Shallow Hal'2001 · as Self
• Shallow Hal2001 · as Mauricio Wilson
• On Edge2001 · as Zamboni Phil
• The Trumpet of the Swan2001 · as Father (voice)
• Bravo Profiles: Penn and Teller2001 · as Self
• The Adventures of Rocky & Bullwinkle2000 · as Boris
• Let's Rap Fire Safety2000
• Ultimate Trek: Star Trek's Greatest Moments1999 · as Host
• The N.Y. Friars Club Roast of Jerry Stiller1999 · as Self - Roastmaster
• Larry David: Curb Your Enthusiasm1999 · as Self
• Love and Action in Chicago1999 · as Frank Bonner
• Madeline: Lost in Paris1999 · as Uncle Horst / Henri (voice)
• Sideshow: Alive on the Inside1999 · as Narrator
• Jingle Bells1999 · as Elf (Voice)
• Denial1998 · as Art Witz
• Titey1998 · as Titey (voice)
• Cinderella1997 · as Lionel
• Love! Valour! Compassion!1997 · as Buzz Hauser
• The Hunchback of Notre Dame1996 · as Gargoyle Hugo (voice)
• The Making of Disney's The Hunchback of Notre Dame1996
• Dunston Checks In1996 · as Robert Grant
• Bye Bye Birdie1995 · as Albert J. Peterson
• The Last Supper1995 · as Anti-Enviroment
• For Better or Worse1995 · as Michael Makeshift
• A Tribute to Stephen Sondheim1995
• The Return of Jafar1994 · as Abis Mal - the Chief of the Thieves (voice)
• Blankman1994 · as Mr. Stone
• North1994 · as North's Dad
• Down on the Waterfront1994
• The Paper1994 · as Marion Sandusky
• Coneheads1993 · as Larry Farber
• Sexual Healing1993 · as Frank
• For Goodness Sake1993 · as Electronics Store Customer
• I Don't Buy Kisses Anymore1992 · as Bernie Fishbine
• Jacob's Ladder1990 · as Geary
• White Palace1990 · as Neil
• Pretty Woman1990 · as Philip Stuckey
• Brighton Beach Memoirs1986 · as Pool Player #1
• The Mosquito Coast1986 · as Hardware Clerk
• Rockabye1986 · as Lt. Ernest Foy
• Senior Trip1981 · as Pete
• The Burning1981 · as Dave
• Broadway: The Next Generation— · as Self
• The Sisters Rosensweig— · as Mervyn
• Leo 2—

All TV Shows (124)

• Mating Season2026 · as Alan (voice)
• LEGO Marvel Avengers: Strange Tails2025 · as Magneto (voice)
• The Bad Guys: The Series2025 · as Mysterious Figure (voice)
• The Bad Guys: The Series2025 · as D.B. Cougar (voice)
• Y llegaron de noche2024 · as Carl Laemmle
• Rock, Paper, Scissors2024 · as Jonathan Fartjoke (voice)
• History of the World: Part II2023 · as Maurice Cheeks
• Star Trek: Prodigy2021 · as Doctor Noum (voice)
• Star Trek: Prodigy2021 · as Counselor Noum (voice)
• The Problem with Jon Stewart2021 · as Jeff Bezos
• History of the Sitcom2021 · as Self - Actor
• Celebrity Wheel of Fortune2021 · as Self - Contestant
• Stars in the House2020 · as Self
• Stars in the House2020 · as Self - Special Guest
• The Movies That Made Us2019 · as Self
• Harley Quinn2019 · as Sy Borgman (voice)
• Mad About You2019 · as Jason Alexander
• The Conners2018 · as Pastor Phil
• Hit the Road2017 · as Ken Swallow
• Young Sheldon2017 · as Gene Lundy
• The Orville2017 · as Olix
• Kody Kapow2017 · as Goji (voice)
• The Marvelous Mrs. Maisel2017 · as Asher Friedman
• Dinner with Dad2017 · as Jason Alexander
• The $100,000 Pyramid2016 · as Self
• Match Game2016 · as Self - Panelist
• To Tell the Truth2016 · as Self - Panelist
• The Grinder2015 · as Cliff Bemis
• The Late Show with Stephen Colbert2015 · as Self - Guest
• Big Time in Hollywood, Fl2015 · as Jason Alexander
• The Late Late Show with James Corden2015 · as Self
• Penn Zero: Part-Time Hero2014 · as Coach Wallace (voice)
• The Tom and Jerry Show2014 · as Rick (voice)
• TripTank2014 · as Doctor (voice)
• Late Night with Seth Meyers2014 · as Self - Guest
• Kirstie2013 · as Stanford Temple
• Hollywood Game Night2013 · as Self
• Drunk History2013 · as William Tweed
• Comedians in Cars Getting Coffee2012 · as Self
• Comedy Bang! Bang!2012 · as Inspector Gantlet
• Talking Dead2011 · as Self
• China, IL2011 · as Harold (voice)
• Franklin & Bash2011 · as Carter Lang
• Harry's Law2011 · as Richard Cross
• Fish Hooks2010 · as Mr. Nibbles
• Fish Hooks2010 · as Mr. Nibbles (voice)
• The Marriage Ref2010 · as Self - Panelist
• The Cleveland Show2009
• Community2009 · as Mountain Man
• Meteor2009 · as Dr. Chetwyn
• Shatner's Raw Nerve2008 · as Self
• Step It Up and Dance2008
• Thank God You're Here2007 · as Self
• Rachael Ray2006 · as Self - Guest
• Talkshow with Spike Feresten2006
• Where My Dogs At?2006
• The New Adventures of Old Christine2006 · as Dr. Palmer
• Everybody Hates Chris2005 · as Principal Edwards
• Criminal Minds2005 · as Prof. Rothchild
• Robot Chicken2005 · as Krampus (voice)
• American Dad!2005 · as Mr. Orlando (voice)
• American Dad!2005 · as Sal (voice)
• The Late Late Show with Craig Ferguson2005 · as Self
• Listen Up!2004 · as Tony Kleinman
• The Tony Danza Show2004 · as Self - Guest
• Two and a Half Men2003 · as Dr. Goodman
• The Ellen DeGeneres Show2003 · as Self
• Real Time with Bill Maher2003 · as Self
• Jimmy Kimmel Live!2003 · as Self
• The Twilight Zone2002 · as Patient
• Monk2002 · as Marty Eels
• Bob Patterson2001 · as Bob Patterson
• Good Day Live2001 · as Self
• The Legend of Tarzan2001 · as Zutho (voice)
• Primetime Glick2001
• Critics Choice Awards2001 · as Self
• Disney's House of Mouse2001
• Curb Your Enthusiasm2000 · as Jason Alexander
• The Huntress2000
• Son of the Beach2000
• Malcolm in the Middle2000 · as Leonard
• The Late Late Show with Craig Kilborn1999 · as Self - Guest
• Dilbert1999 · as Catbert (voice)
• Hollywood Squares1998 · as Self - Panelist
• Hercules1998 · as Poseidon
• Hercules1998 · as Poseidon (voice)
• Muppets Tonight1996 · as Self
• Remember WENN1996 · as Alan Ballinger
• Star Trek: Voyager1995 · as Kurros
• Friends1994 · as Earl
• Duckman1994 · as Duckman (voice)
• Aladdin1994 · as Abis Mal (voice)
• Aladdin1994 · as Captain Albatross (voice)
• Aladdin1994 · as Abis Mal / Abnor Mal (voice)
• The Nanny1993 · as Jack
• The Larry Sanders Show1992 · as Jason Alexander
• Dinosaurs1991 · as Grown Baby (voice)
• Dinosaurs1991 · as Stu (voice)
• Dinosaurs1991 · as The Job Wizard (voice)
• Dinosaurs1991 · as Gus Molehill (voice)
• Dinosaurs1991 · as Sexual Harris (voice)
• Dinosaurs1991 · as General H. Norman Conquest (voice)
• Dinosaurs1991 · as UFO! Host / Announcer (voice)
• Dream On1990 · as Randall Townsend
• The Simpsons1989 · as Bourbon Verlander (voice)
• Seinfeld1989 · as George Costanza
• Favorite Son1988 · as Chris Van Allen
• LIVE with Kelly and Mark1988 · as Self - Guest
• Everything's Relative1987 · as Julian Beeby
• E/R1984 · as Harold Stickley
• E/R1984
• Jeopardy!1984 · as Self
• Reading Rainbow1983 · as Self - Narrator (voice)
• Newhart1982
• Late Night with David Letterman1982 · as Self
• A Capitol Fourth1980 · as Self
• Saturday Night Live1975 · as Self - Host
• Saturday Night Live1975 · as Self - Cameo (uncredited)
• Saturday Night Live1975 · as Titey (voice)
• People's Choice Awards1975 · as Self - Host
• Tony Awards1956 · as Self - Presenter
• The Emmy Awards1949 · as Self
• Golden Globe Awards1944 · as Self - Nominee
• Saturday TV Funhouse— · as Titey (voice)