- One year for his birthday, his friends took him to a diner. They told him to close his eyes. When he opened them, William Shatner, aka Captain James T. Kirk, was in front of him. Captain Kirk was Jason's childhood hero.
- Started losing his hair at the age of 16.
- The only major cast member of Seinfeld (1989) to also direct an episode of the series.
- While filming Seinfeld (1989), was always fitted with a suit one size too small, to make his character look "uncool"
- In Seinfeld: How It Began (2004), a documentary for the Seinfeld (1989) DVD, Alexander said that he had no idea that 'George Costanza (character)' was based on Larry David until he said of a script to David, "this could never happen to anyone, and even if it did, no human being would react like this" to which David replied, "What do you mean? This happened to me once, and this is exactly how I reacted!".
- The only of the four main actors (Michael Richards, Jerry Seinfeld and Julia Louis-Dreyfus) from Seinfeld (1989) not to win an Emmy for their work on the show
- Attended Boston University but left a year early because he was able to find acting work in New York City during the summer before his senior year. Received an honorary degree years later.
- Won $250,000 on a celebrity episode of Who Wants to Be a Millionaire (2002) after he correctly identified Gerald Ford as the President who said "My fellow Americans, our long national nightmare is over". However, his question for $500,000 asked how Harry Crosby got his nickname of "Bing". He did not know, and walked away with the $250,000 that was divided amongst three charities.
- Says he took on the role of Duckman because Duckman was "the anti-George Costanza".
- Being a great fan of Star Trek (1966), he was finally given the opportunity to play a "Trek" role himself in 1999: he played the character "Kurros" in the Star Trek: Voyager (1995) episode, Think Tank (1999). That same year, he was the host for the "Star Trek Viewers' Choice" VHS, notably for his Capt. Kirk impersonations.
- During the filming of The Mosquito Coast (1986) of which he had a minor part, Alexander had a gun pointed at him by a potential robber. While in location in Rome, Georgia as he was out shopping in what turned out to be a not so safe area he had a gun put to his head from behind. Not knowing what was the thing pressing on his head, Alexander twisted, reached up, grabbed the robber's hand and arm and pulled forward just as the robber started shooting. Alexander claims he managed this due to long years of martial arts training. He was not hurt and managed to break the man's arm and one finger as he pulled the gun from his hand before fleeing the scene. The story was told on Kevin Pollak's podcast number 86.
- Runs his own company in Los Angeles called Angel Ark Productions. (February 2010)
- In 2004, Alexander joined "One Voice", an organization which tried to propose peace talks between Israel and Palestine. He first heard about the group from its main organizers during a meeting at the home of Danny Devito and Rhea Perlman in 2003. Organizers established an "Entertainment Council" to help mobilize actors, writers, producers, directors and others to back the project.
He visited Tel Aviv, Israel. Organizers planned to bring other celebrities to Israel to help promote the project and have established an "Entertainment Council" to help mobilize actors, writers, producers, directors and others to back it. - Fall 2002: Set to teach acting on the faculty of the University of Southern California as the first-ever George Burns Distinguished Visiting Professor in Performance.
- The son of Ruth and Alex Greenspan and half-brother of Karen Van Horn and Michael Greenspan, Jason reportedly took the professional surname of "Alexander" in part because of his father's first name. However, he has also said it helped him in auditions as call-backs were done in alphabetical order and he would know before other actors if he was still in the running for a particular part or role.
- 1989: Appeared on Broadway in Jerome Robbins's musical "Broadway", for which he won a Tony award.
- He lent his voice to the Family Guy (1999) album "Live in Las Vegas" during the number 'All Cartoons Are F**kin' Dicks'.
- 4/30/06: Debuted as a "professional magician" at the Magic Castle in Los Angeles. His act is based on studying and predicting behavioral patterns with his subjects.
- Jason Greenspan adopted the stage name Jason Alexander while still in high school in New Jersey. He was soon appearing in Broadway plays and movies, then in the hit TV series, Seinfeld (1989), from 1990 to 1998. Alexander also directs and produces films.
- Alexander's wife, Daena E. Title, is a cousin of filmmaker Stacy Title, who is married to actor Jonathan Penner. The couple has two sons, Gabe Greenspan and Noah Greenspan.
- Appeared in a PSA for the ASPCA. Also appeared, with Valerie Bertinelli, on a commercial for "Jenny Craig". (In early 2010, he was named a celebrity spokesperson for Jenny Craig). (2010)
- Won the 1989 Tony Award (New York City) for Actor in a Musical for "Jerome Robbin's Broadway".
- He was nominated for the 2016 New Jersey Hall of Fame in the Performance Arts category. He was inducted in the 2018 New Jersey Hall of Fame in the Performing Arts category.
- Appeared, with Valerie Bertinelli, on a commercial for "Jenny Craig". (2010)
- A 1977 graduate of Livingston High School (in Livingston, New Jersey), one of his classmates was Julia Montgomery, with whom he appeared in numerous high school productions. Alexander's high school performing credits include such musicals as "Guys and Dolls", "The Odd Couple", and "Oliver". Alexander also played flute and percussion in the Livingston Lancer's Marching Band.
- 2005: Celebrity Judge for UCLA Spring Sing.
- Rehearsing to play Max Bialystock in The Producers at the Pantages Theatre in LA beginning May 2. (March 2003)
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