He made his stage debut in 1935, at the Teatro delle Quattro Fontane in Rome, where he sang mostly comprimario roles.
He then joined the Rome Opera in 1938, where he quickly established himself as one of the leading basses of his generation.
After the war he began appearing abroad, notably at the Royal Opera House in London, the Liceo in Barcelona, the Bavarian State Opera in Munich, the Teatro Colón in Buenos Aires, etc.
He sang most of the great bass roles in opera by Verdi and some Wagner, such as Sparafucile, Ferrando, Fiesco, Padre Guardiano, Grand Inquisitore, Ramfis, King Heinrich, King Marke, Gurnemanz, etc.
Neri had a dark, powerful, cavernous voice and a strong stage presence.