His babysitter was Mary Travers of the folk-rock group Peter, Paul and Mary.
Once played the mandolin in a high-school band with Arlo Guthrie.
Made his film debut in an uncredited role in the 1971 comedy-drama The Hospital.
Joined the cast of Saturday Night Live during the 1984-85 season as the Weekend Update anchor.
Costarred in Rob Reiner's 1984 mockumentary This Is Spinal Tap, about a heavy-metal band; his character, Nigel Tufnel, was said to have been a parody of British rocker Jeff Beck. Later reteamed with Reiner in 1987's The Princess Bride, playing Count Rugen.
Inherited family's royal designation after his father's death in 1996, making him the 5th Baron Haden-Guest of Saling, a district outside of London.
Formed the instrumental group the Beyman Bros, along with friends David Nichtern and CJ Vanston, in 2009.
2004, Critics' Choice Awards — Best Acting Ensemble: Nominee
2001, Independent Spirit Awards — Best Director: Nominee
2001, Writers Guild Awards — Original Screenplay: Nominee
1998, Independent Spirit Awards — Best Screenplay: Nominee
1976, Emmy — Outstanding Writing for a Comedy-Variety or Music Special: Winner
1998, Independent Spirit Awards — Best Male Lead: Nominee
2004, Independent Spirit Awards — Best Screenplay: Nominee
2003, Grammy — Best Song Written for a Motion Picture, Television or Other Visual Media: Winner
Peter Haden-Guest — Father
Annie Haden Guest — Daughter
Jamie Lee Curtis — Wife
Thomas Haden Guest — Son
Jean Hindes — Mother
Elissa Smith — Sister
Nicholas Guest — Brother
Anthony Haden-Guest — Half Brother
Attended Bard College, Annandale-on-Hudson, New York, United States; attended New York University, New York, New York, United States