Born in Rome, Prosperi began his career as an assistant director with
Mario Bava and with whom he also wrote several screenplays. In 1966, he made his directorial debut, credited as Frank Shannon, with the thriller film,
Tecnica di un omicidio and over the years, he built a solid reputation as a director of crime-action films. He also occasionally directed comedies (with
Lando Buzzanca or
Alighiero Noschese) and, in the final stage of his career, at the beginning of the 1980s, several low-budget
sword and sorcery films. == Selected filmography ==