Born in Rome, Italy. Entered Italian films as a writer in 1953 and began directing some his own screenplays in 1961. Notable writing credits (alone or collaboration) include UN MARITO PER ANNA ZACCHEO, 1953; CUORE DE MAMMA, 1954; SUOR MARIA, 1955; IL FERROVIERE, 1956; SERENATA A MARIA, 1957; L'UOMO DI PAGLIA, 1958; UN MALEDETTO IMROGLIO, 1959; UN GIORNO DA LEONI and DIVORZIO ALL'ITALIANA, both 1961; LA SPADA DEL CID, 1962; AMORI PERICOLOSI, 1964 (also director); LE LIT &A` DEUX PLACES, 1965; LA RAGAZZA IN PRESTITO, 1966 (also director); L'IMMORALE, 1967; SERAFINO, 1969; RAGAZZO DE BORGATA and FEBBRE DA CAVALLO, both 1976; IL CACCIATORE DE SQUALI, 1979; IL BANDITO DAGLI OCCHI AZZURRI, 1980 (also director); LEGATI DA TENERA AMICIZIA, 1983; and BEN WEBSTER: THE BRUTE AND THE BEAUTIFUL, 1989. Beginning the the early 1970s, Giannetti also wrote and directed extensively for television. Giannetti died of a stroke in Rome in 1995..  Writing (Best Story and Screenplay Written Directly for the Screen) 1962: DIVORZIO ALL'ITALIANA (DIVORCE - ITALIAN STYLE) (w. Ennio DeConcini & Pietro Germi) 1 nomination, 1 Award