Italian actor and novelist, a 1953 graduate of the prestigious Centro Sperimentale di Cinematografia in Rome, marking the beginning of a long and illustrious career in the world of cinema.
Longo made his screen debut in the adventure drama Moana, Virgin of the Amazon in 1955, a film shot on location in Venezuela, where he received his only star billing.
Following this initial success, Longo's roles became less prominent, often cast as a supporting character, frequently playing an antagonist in wartime action, sword-and-sandal epics, pirate adventures, and spaghetti westerns.
Throughout his career, Longo collaborated with many international co-productions, sharing the screen with renowned English-speaking genre actors such as Lex Barker, Gordon Mitchell, Don Megowan, John Ericson, and Mark Forest.
In the late 1960s, Longo adopted pseudonyms like Herman Lang, James Harridon, or Grant Laramy for some of his roles.
As the years passed, Longo's focus shifted towards acting in made-for-TV movies and mini-series, a career path he would continue until his quasi-retirement in 1981.
In addition to his acting career, Longo also worked as a dubbing artist and occasional dubbing director, providing the voice for a multitude of cartoon characters, as well as for foreign stars like Hal Holbrook, Jack Hawkins, Louis Gossett Jr., and Patrick Magee.