Jason Alexander is an American actor, director, and singer best known for playing George Costanza on Seinfeld from 1989 to 1998. Born Jay Scott Greenspan, he built a career that runs from Broadway musicals to network sitcoms, animated voice work, and modern streaming projects, and he remains active in theater and film today.
Early Life and Path Into Acting
Alexander was born on September 23, 1959, in Newark, New Jersey, to Ruth Minnie Greenspan, a nurse and health care administrator, and Alexander B. Greenspan, an accounting manager. He later borrowed his father’s first name to form his stage name. He graduated from Livingston High School in Livingston, New Jersey, in 1977, and has a half-sister, Karen Van Horne, and a half-brother, Michael Greenspan.
His mother ran a school of nursing and, according to Alexander, worked alongside polio vaccine researcher Jonas Salk, which shaped a household that took medicine and public health seriously. He made his Broadway debut in 1981 in Hal Prince and Stephen Sondheim’s Merrily We Roll Along, then moved through a run of stage work that included Forbidden Broadway, The Rink, Neil Simon’s Broadway Bound, Personals, and the thriller Accomplice.
Building a Career Before Seinfeld
Eight years before Seinfeld premiered, Alexander was already a working New York stage actor with a Tony Award to his name. In 1989, he won Best Actor in a Musical for Jerome Robbins’ Broadway, where he took on multiple roles including Tevye from Fiddler on the Roof and Pseudolus from A Funny Thing Happened on the Way to the Forum.
Television work came earlier than most fans realize. From 1984 to 1985, he co-starred as hospital administrator Harold Stickley on the CBS series E/R, alongside a young George Clooney, years before either actor became widely known. He also had a supporting role on the ABC sitcom Dinosaurs, playing a character named Al Harass in episodes built around workplace harassment storylines.
The Role That Made Him Famous: George Costanza on Seinfeld
Alexander played George Costanza, Jerry Seinfeld’s anxious, scheming best friend, across all nine seasons of Seinfeld from 1989 to 1998. The character became one of the most quoted figures in American sitcom history, built on Alexander’s timing and his willingness to play George as pitiful, petty, and oddly sympathetic at once.
The role turned Alexander into a household name after more than a decade of stage work that theater audiences knew, but television audiences did not. Seinfeld grew from a slow-building cult favorite into one of the highest-rated shows on American television by its third season, and a TV Guide readers and critics poll later ranked George Costanza among the top ten characters in television history.
1. Awards and Recognition for Seinfeld
Alexander was nominated for seven consecutive Primetime Emmy Awards for Outstanding Supporting Actor in a Comedy Series for his work on Seinfeld, along with four Golden Globe nominations. He won a Screen Actors Guild Award for Outstanding Performance by a Male Actor in a Comedy Series, and he shared in the show’s ensemble SAG Award as well.
He did not convert his Seinfeld Emmy nominations into a win during the show’s run, but he later won a Daytime Emmy Award for Outstanding Original Song in 2020 for his contribution to Brainwashed by Toons. That range, from primetime sitcom recognition to a songwriting Emmy decades later, reflects how wide his creative work has stretched.
Why George Costanza Still Resonates With Audiences
Seinfeld ended its run in 1998, yet George Costanza remains a reference point in everyday conversation, from workplace complaints to dating stories. Streaming platforms have introduced the character to viewers who were not yet born when the finale aired, and the show consistently ranks among the most rewatched sitcoms in American television.
Alexander has spoken about the character in interviews for years, describing George as a heightened version of insecurities most people recognize in themselves rather than a purely comic invention. That grounding, paired with the show’s tight writing, is a large part of why the role has outlasted the decade it aired in, and why casting directors and audiences still associate Alexander’s name with it first, even after thirty seasons of other work.
Broadway and Stage Work
Stage work has stayed part of his career alongside television and film. He appeared in the Los Angeles production of The Producers, served as Artistic Director of Reprise! Broadway’s Best in Los Angeles, and in 2015 stepped into Larry David’s lead role in the Broadway play Fish in the Dark.
In June 2026, he returns to the stage for a live conversation and performance event, As Long As You’re Asking, at Chicago Shakespeare Theater, where audiences choose which stories he tells about his career and his activism. The format, part comedy, part musical performance, part unscripted conversation, mirrors the mix of skills he built during his years as a stage performer before television made him famous.
Film and Television Roles After Seinfeld
Alexander’s film work includes playing Phillip Stuckey, Richard Gere’s calculating lawyer, in Pretty Woman in 1990, and voicing the gargoyle Hugo in Disney’s The Hunchback of Notre Dame in 1996. He also voiced the title role in the adult animated series Duckman across four seasons in the mid-1990s, running at the same time as his Seinfeld years, and later lent his voice to Catbert, the human resources director in the animated series based on the Dilbert comic strip.
Landing a second hit series proved difficult. His first post-Seinfeld lead role, the ABC sitcom Bob Patterson, was canceled after five episodes in 2001. A second attempt, the CBS sitcom Listen Up!, ran for one season from 2004 to 2005 before it too was canceled. Since then, he has worked mostly in guest and supporting roles rather than chasing another series lead.
He has kept working steadily on television since Seinfeld ended. He guest-starred multiple times on Curb Your Enthusiasm, including cameo appearances playing a version of himself, played Asher Friedman on The Marvelous Mrs. Maisel from 2018 to 2023, and portrayed Gene Lundy on Young Sheldon from 2018 to 2024. He also voiced Doctor Noum on the animated series Star Trek: Prodigy and Sy Borgman on Harley Quinn.
1. Recent and Upcoming Projects
More recently, Alexander appeared in The Electric State in 2025 and is set to play Louis B. Mayer, the MGM studio founder, in the film Jimmy, expected in 2026. He continues to take on both live-action and voice roles, moving between comedy, drama, and animation rather than sticking to one lane.
This steady mix of stage, screen, and voice work is part of why casting directors keep coming back to him decades after Seinfeld. Few actors from a single defining sitcom role manage to stay this visible across so many formats.
Directing and Other Creative Work
Beyond acting, Alexander has directed episodes of Seinfeld, Everybody Loves Raymond, and Til Death, and he has directed stage productions during his time at Reprise! Broadway’s Best in Los Angeles. He was also involved in developing the PBS children’s series The Magic School Bus, extending his reach into educational television.
He produced The Last Laugh, a documentary examining the history and impact of comedy, released in 2016. That project reflects a recurring theme in his later career, using his own industry standing to explore comedy and performance from behind the camera rather than only in front of it.
Personal Life and Public Advocacy
Alexander has been married to Daena Title since 1982. He has served as the national spokesman for the Scleroderma Foundation, raising awareness of the autoimmune disease and supporting people affected by it, a cause connected to loved ones in his own life dealing with autoimmune illness.
He also partnered with the American Nurses Association and Sanofi on the Not Today, Flu campaign, encouraging people to get an annual flu vaccine, a cause he has connected publicly to his mother’s career as a nurse educator. He has publicly supported the OneVoice initiative, which gathers input from Israeli and Palestinian citizens working toward a negotiated peace, and has spoken about visiting Israel multiple times.
In 2010, Alexander became the public face of a Jenny Craig weight loss campaign after losing 30 pounds in 18 weeks on the program, and he later continued on its maintenance plan. Away from acting, he is an avid poker player who has taken part in televised poker tournaments.
Where Jason Alexander Is Today
As of 2026, Jason Alexander, age 66, continues to work across film, television, and theater. He has film credits scheduled for 2026, a live stage event booked at Chicago Shakespeare Theater, and a body of past voice and directing work that keeps finding new audiences through streaming.
Estimates place his net worth at around 50 million dollars, built over more than four decades of acting, directing, producing, and stage work. What stands out about his career is not just the George Costanza role that made him famous, but how much he has done on either side of it, from a Tony Award before Seinfeld to a Daytime Emmy and steady screen work long after it, along with two short-lived sitcom leads that show fame does not always translate cleanly from one role to the next.
For anyone tracking his career going forward, the pattern to watch is the same one that has defined it for four decades: a stage commitment, a film role, and an animated voice credit running at the same time, rather than one project at a time. That approach, built during his years splitting time between Broadway and early television guest spots, has let him keep working steadily long after most sitcom co-stars of his generation slowed down. It also means new credits tend to appear with little advance notice, since he moves between mediums rather than committing to a single ongoing series.
Note for editorial review: figures such as net worth estimates and upcoming release dates should be reconfirmed close to publication, since these details change and are compiled from third-party sources rather than official financial disclosures.
