Born in Rome, Gelli started his career as part of several theatrical companies, and later acting in some RAI radio and television dramas.
He made his film debut in 1962, with a minor role in Luciano Salce's A Girl... and a Million.
He played Cimosco in several theatrical editions of Orlando Furioso directed by Luca Ronconi, and Don Nicolò Paritelli in three editions of Rugantino.
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