Born in
Campagnano di Roma, Pirri entered the cinema industry as an actor, playing very minor roles while he was completing his engineering degree, and then he worked as an assistant director of
Luciano Emmer and
Folco Quilici. In 1972 he made his directorial debut with the documentary film
La mattanza, which was followed by several other documentaries. In 1977 he directed his most known film,
Italia: Ultimo atto?, one of the first with the links of Italian terrorists and the police apparatus, and one year later he directed the controversial ''
L'immoralità, the unusual story of a young girl in love with a serial killer. His last project, the short documentary Il mestiere dello sceneggiatore'', was made in collaboration with the screenwriter
Tonino Guerra and was screened at the
Venice Film Festival. In his last years he worked on religious-themed stories. == Filmography ==