Jason Alexander

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.

Jason Alexander is known for work in acting across film and television. New Release currently presents 30 verified screen credits connected to this profile.

Selected work includes Jimmy (2026), To Kill a Nazi (2026), Mating Season (2026), The Gettysburg Address (2025), LEGO Marvel Avengers: Strange Tails (2025), The Bad Guys: The Series (2025), The Electric State (2025), Y llegaron de noche (2024). The recorded credits span 2001 to 2026, including 21 movies and 9 TV shows.

The filmography below lists available titles, release years and known roles. This profile is updated as additional verified information becomes available.