
Acting · born 1959 · Newark, New Jersey, USA
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
Louis B. Mayer · Nov 6, 2026

The Sisters Rosensweig
Mervyn · Date TBA

Leo 2
Date TBA
Doom Scroll
Date TBA

Saturday TV Funhouse
Titey (voice) · Date TBA

Pretty Woman
Philip Stuckey · 1990

Hachi: A Dog's Tale
Carl · 2009

The Hunchback of Notre Dame
Gargoyle Hugo (voice) · 1996

The Return of Jafar
Abis Mal (voice) · 1994

Shallow Hal
Mauricio Wilson · 2001

Young Sheldon
Gene Lundy · 2017

Seinfeld
George Costanza · 1989

Jacob's Ladder
Geary · 1990

Wild Card
Pinky · 2015

The Electric State
Ted / Wingman · 2025

The Orville
Olix · 2017

Leo
Jayda's Dad (voice) · 2023

101 Dalmatians II: Patch's London Adventure
Lightning (voice) · 2003

Agent Cody Banks
Executive Producer · 2003

Harley Quinn
Sy Borgman (voice) · 2019

Everybody Hates Chris
Principal Edwards · 2005

Coneheads
Larry Farber · 1993

The Marvelous Mrs. Maisel
Asher Friedman · 2017

Curb Your Enthusiasm
Jason Alexander · 2000

The Hunchback of Notre Dame II
Gargoyle Hugo (voice) · 2002

Agent Cody Banks 2: Destination London
Executive Producer · 2004

The Mosquito Coast
Hardware Clerk · 1986

The Burning
Dave · 1981

The Adventures of Rocky & Bullwinkle
Boris · 2000