[5] Jaglom trained with Lee Strasberg at the Actors Studio in New York, where he acted, wrote and directed off-Broadway theater and cabaret before settling in Hollywood in the late 1960s.
[6] Under contract to Columbia Pictures,[7] Jaglom featured in such TV series as Gidget and The Flying Nun and acted in a number of films which included Richard Rush's Psych-Out (1968), Boris Sagal's The Thousand Plane Raid (1969), Jack Nicholson's Drive, He Said (1971), Dennis Hopper's The Last Movie (1971), Maurice Dugowson's Lily, aime-moi (1975) and Orson Welles' The Other Side of the Wind (1970–1976; 2018).
Déjà Vu (1997) was about the yearning of people trying to find their perfect soul mate and was the only film in which Vanessa Redgrave and her mother, Rachel Kempson, appeared together.
Hollywood Dreams (2007) dealt with a young woman's obsession with fame in the film industry and introduced Tanna Frederick, who then starred in Jaglom's Irene in Time (2009), a look at the complex relationships between fathers and daughters, and Queen of the Lot, the sequel-of-sorts to Hollywood Dreams that co-starred Noah Wyle as well as Christopher Rydell, Peter Bogdanovich, Jack Heller, Mary Crosby, Kathryn Crosby, and Dennis Christopher.
He edited The M Word, which stars Frederick, Frances Fisher, Michael Imperioli, Gregory Harrison, and Corey Feldman for a Fall 2013 theatrical release.
[15] Jaglom has written four plays that have been performed on Los Angeles stages: The Waiting Room (1974), A Safe Place[11] (2003), Always—But Not Forever (2007)[16][17] and Just 45 Minutes from Broadway[18] (2009/2010).