- Was chosen for the role of Marshall Eriksen in How I Met Your Mother (2005) because of his work on the short lived television show Freaks and Geeks (1999) of which creators Carter Bays and Craig Thomas were huge fans.
- Had a five year relationship (March 2001-January 2007) with his Dead Man on Campus (1998) and Freaks and Geeks (1999) co-star Linda Cardellini. They played a couple both in the film and the TV show. Segel stated in an interview with Los Angeles Times that Cardellini was a great girlfriend and the title character in Forgetting Sarah Marshall (2008) was not based on her, it was more an amalgamation of a lot of different relationships and breakups he had.
- He plays piano.
- He was on a high school basketball team that won state in California.
- Received Harvard University's Hasty Pudding 2012 Man of the Year award on February 3, 2012.
- Is an Ordained Minister with the Universal Life Church and married couple Jason Wood and Abbe Wood on Episode #18.79 (2010) on July 6th, 2010. This was only the second marriage to be performed on the Tonight Show. The first marriage was Tiny Tim and his wife, Vicki Budinger, in 1969, on Tiny Tim's Wedding to Miss Vicki (1969).
- His father's family is Jewish (from Russia, Poland, and Austria). His mother has English, Scottish, Irish, and fairly distant French, ancestry. Jason had a Bar Mitzvah ceremony.
- Likes classic rock and reggae music.
- He loves Disneyland.
- His father Alvin is a lawyer, and his mother Jill is a homemaker.
- Segel means "sail" in German and Swedish.
- Has an older brother named Adam.
- On June 16, 2025. Segel announced his engagement to actress Kayla Radomski. After nearly two year of dating.
- Has a sister, Alison, born March 9, 1986.
- He wrote and starred in Forgetting Sarah Marshall (2008) and he also plays a character named Marshall on How I Met Your Mother (2005).
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