- Son of late actor John Ritter and actress Nancy Morgan.
- First appeared on national television when he was one year old. In the Three's Company (1976) opening credits from seasons 6 to 8, he is seen standing next to "Janet Wood" as she is petting a goat. This was revealed by Joyce DeWitt in a special feature on a Three's Company (1976) DVD set.
- Jason's father, grandmother, and grandfather (on his mother's side) all died in 2003.
- Grandson of Tex Ritter and Dorothy Fay.
- (February 16, 2017) He is engaged to his girlfriend of four years, actress Melanie Lynskey.
- BFA in Drama - New York University, Tisch School of the Arts (2002).
- Jason graduated from New York University's Tisch School of the Arts, where he studied at the Atlantic Theatre Company.
- Has a daughter (b. December 2018) with his wife Melanie Lynskey.
- Stepson of Amy Yasbeck.
- Close friends with Bryce Dallas Howard and Seth Gabel.
- Has played the love interest of both Gilmore Girls (2000) main cast in different shows, Lauren Graham in Parenthood (2010) and Alexis Bledel in Us & Them (2014).
- Nephew of Tom Ritter.
- Cousin of Joseph Potts, who is a coach in Kansas City Royals organization.
- Former boyfriend of actress Marianna Palka.
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