Jason Alexander is the actor best known for playing George Costanza, Jerry Seinfeld’s anxious, scheme-prone best friend, on the NBC sitcom Seinfeld from 1989 to 1998. The role brought him seven consecutive Emmy nominations, four Golden Globe nominations, and a Screen Actors Guild Award.
Born Jay Scott Greenspan, he built a career that stretches well past that one part, moving between network television, animated film, and Broadway with equal ease. Decades after Seinfeld ended, he still works as an actor, director, and stage performer, and this guide also clears up a common mix-up with a different, much younger Jason Alexander who plays professional baseball.
Early Life and the Path to Acting
Alexander was born on September 23, 1959, in Newark, New Jersey, to Ruth and Alexander Greenspan, a nurse and an accounting manager. He grew up in nearby Livingston, New Jersey, and graduated from Livingston High School in 1977, where he had already appeared in school productions of Guys and Dolls, The Odd Couple, and Oliver.
He enrolled at Boston University planning to study classical acting, but a professor steered him toward comedy after watching him perform, and he left the school before his senior year once paid stage work in New York City came through. Boston University later awarded him an honorary degree.
He adopted the stage name Jason Alexander early in his career and worked steadily in New York theater through the late 1970s and 1980s, years before national television made him a household name.
George Costanza and the Seinfeld Years
Alexander won the role of George Costanza in 1989, playing a character loosely modeled on Seinfeld co-creator Larry David. Over nine seasons, George became one of network television’s most recognizable comic characters: short-tempered, insecure, and prone to elaborate schemes that rarely worked out for him.
The part earned Alexander a Screen Actors Guild Award for Outstanding Performance by a Male Actor in a Comedy Series in 1995, along with seven straight Primetime Emmy nominations and four Golden Globe nominations. He never won an Emmy for the role, one of the more debated award snubs of 1990s television among critics who covered the show.
After Seinfeld ended in 1998, Alexander returned to the character occasionally, including cameo appearances alongside his three main castmates in later seasons of Curb Your Enthusiasm.
The role’s honors add up to one of the more decorated supporting turns in sitcom history:
- Screen Actors Guild Award, Outstanding Performance by a Male Actor in a Comedy Series (1995)
- Seven consecutive Primetime Emmy nominations for Outstanding Supporting Actor in a Comedy Series
- Four Golden Globe nominations for Best Supporting Actor in Television
- A Tony Award the same year Seinfeld premiered, for a separate Broadway role
Why George Costanza Still Resonates
George Costanza has held up well outside the show itself. TV Guide included him on its list of the 50 best characters in television history, and comedian Ricky Gervais has separately called him arguably the greatest sitcom character of all time.
Alexander has pointed to George’s most humiliating moments as the ones fans bring up most, which tracks with how the character built its reputation: through cringing situations that still get referenced in casual conversation.
The show is still finding new audiences, too. Sony Pictures Television renewed its Netflix licensing deal for another five years in 2026, and Nielsen data reported by Variety showed the series reached roughly 60 million American viewers in the first half of that year alone.
Television and Film Roles Beyond Seinfeld
Television Guest and Series Roles
Alexander’s television work reaches well beyond one sitcom. He appeared as a well-educated serial killer in a memorable 2008 guest role on Criminal Minds, played “Al Sexual Harris” on the ABC sitcom Dinosaurs, and picked up an Emmy nomination for a guest turn on Dream On.
He joined the cast of Everybody Hates Chris as a regular for its second season in 2006, guest starred on Malcolm in the Middle, and later appeared on The Marvelous Mrs. Maisel in 2019. He also fronted two of his own network sitcoms, ABC’s short-lived Bob Patterson in 2001 and CBS’s Listen Up!, a comedy loosely based on sports commentator Tony Kornheiser that he also executive produced.
Film Roles
On the film side, Alexander played lawyer Philip Stuckey in Pretty Woman (1990), one of the year’s biggest box office hits, and took on smaller character roles later on, including a part in Shallow Hal. He also executive produced the family film Agent Cody Banks and its sequel.
Voice Acting and Animation Work
His voice work reached an audience well outside the sitcom crowd. He voiced Hugo the gargoyle in Disney’s The Hunchback of Notre Dame (1996), lent his voice to Disney’s 101 Dalmatians II and The Return of Jafar, and voiced the title role in the animated series Duckman from 1994 to 1997. That range, a Disney sidekick one year and an adult animated antihero the next, shows how far his voice work traveled beyond his on-screen roles.
A Broadway Career That Predates and Outlasts Seinfeld
Alexander was a working Broadway performer years before Seinfeld existed, and he never left the stage once the show made him famous. In 1989, the same year he was cast as George Costanza, he won a Tony Award for Best Actor in a Musical for Jerome Robbins’ Broadway, a role he also wrote the libretto for.
He returned to Broadway decades later to star in Fish in the Dark, Larry David’s 2015 comedy, and in John Patrick Shanley’s The Portuguese Kid at Manhattan Theatre Club. In 2023, he made his Broadway directing debut with The Cottage.
Stage Work Beyond Broadway
His stage resume outside Broadway is just as long. He starred in the world premiere of Robert Ulin’s Judgment Day at the Chicago Shakespeare Theatre, earning a Jeff Award nomination, and has taken on musical direction and performing roles in productions of Sunday in the Park with George and The Fantasticks for the Reprise Theatre Company.
Directing on the West Coast
On the West Coast, Alexander served as artistic director of the Reprise Theatre Company in Los Angeles and directed productions including The God of Hell at the Geffen Playhouse, a revised revival of Damn Yankees, and Native Gardens at the Pasadena Playhouse.
Directing, Teaching, and Life Off Camera
Alexander teaches acting classes and has led masterclasses on the business side of the industry for working performers. He is also a serious amateur magician, and in 2006 he debuted as a professional magician at the Magic Castle in Los Angeles, a private club for magic performers. His official speaker bio also lists him as a poker player and an advocate on social and political issues outside of his acting work.
He married Daena E. Title in 1981, and the two have two sons, Gabriel and Noah. The family has lived in the Los Angeles area for most of his career.
Alexander has written for younger readers too, publishing the children’s book Dad, Are You the Tooth Fairy? through Scholastic in 2005. He also hosted the Comedy Central roast of William Shatner in 2006 and presented at the 46th annual Grammy Awards.
Is This the Same Jason Alexander Pitching for the Astros?
No. A different, unrelated Jason Alexander pitches professionally in Major League Baseball. Jason Raymond Alexander, born in 1993 in Windsor, California, made his MLB debut with the Milwaukee Brewers in 2022 and has since pitched for the Athletics and the Houston Astros.
The two men share a name and nothing else. One is a Newark-born actor turned Broadway director in his mid-sixties. The other is a right-handed pitcher three decades younger who grew up in California and played college baseball at Menlo College before working his way through the minor leagues.
Searches for “Jason Alexander” turn up both men, so if the pitching stats, team rosters, or box scores that come up don’t match what you expected from the Seinfeld actor, this mix-up is almost certainly why. It is worth checking the birth year before assuming an article or stat line is about the actor.
Where Jason Alexander Is Now
Alexander continues to work in theater more than television these days. In 2024, he starred as Tevye in a production of Fiddler on the Roof at the La Mirada Theatre for the Performing Arts in Southern California, one of several stage leads he has taken on in recent years.
He has also appeared in workshops of new plays around Los Angeles, including Parents in Chains alongside Yvette Nicole Brown and Kristen Bell, and continues to direct regional theater productions between acting jobs. His directing credits in this period include The Joy Wheel at The Ruskin Group Theatre and If I Forget at the Fountain Theatre.
Nearly three decades after Seinfeld ended, Jason Alexander still shows up on stages and in rehearsal rooms most working weeks. He splits his time between directing, teaching, and the occasional screen role, and he has kept doing that steadily instead of leaning on one famous part for the rest of his career.
