Peter Firth the film adaptation of "Equus". The film was only a moderate box-office success, but earned Firth a nomination for the Academy Award for Best Supporting Actor and a Golden Globe award in the same category. Further film work quickly followed, most notably Roman Polanski's "Tess" (1979). In May 1981, he appeared on Broadway again in Peter Shaffer's "Amadeus" as Wolfgang Amadeus Mozart, replacing Tim Curry. Shaffer had offered him the role in the original London production, but he was unavailable due to film commitments. Other film work has included roles in "Diamonds on Wheels" (1973); "When You Comin' Back, Red
Equus (play) Dysart to understand the cause of the boy's actions while wrestling with his own sense of purpose. The original stage production ran at the National Theatre in London between 1973 and 1975, directed by John Dexter. Alec McCowen played Dysart, and Peter Firth played Alan Strang. Later came the Broadway productions that starred Anthony Hopkins as Dysart (later played by Richard Burton, Leonard Nimoy, and Anthony Perkins) and from the London production, Peter Firth as Alan. When Firth left for Broadway, Dai Bradley took over the role of Alan in the London production, playing opposite Michael Jayston as Dr. Dysart.