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His beginnings were in vaudeville theaters and the radio; afterwards he hosted several children-oriented TV shows, such as "El Circo de Marrone" (Marrone's Circus), playing the clown character Pepitito. His recurring catchphrase was Cheee!.
He married twice and had a daughter, "Coqui", with his first wife, Rosa. Still married, Marrone fell in love with Juanita Martínez, but they waited to get together until Rosa died. In 2001, a decade after Marrone's death, Juanita committed suicide, and her body was found with a picture of Marrone in her hands.
"Pepitito" Marrone is one of the most important humorist of the Argentine culture of the 50s and the 60s.
- Su última pelea (1949)
- La barra de la esquina (1950)
- Buenos Aires, mi tierra querida (1951)
- Vida nocturna (1955)
- Rebelde con causa (1961)
- Cristóbal Colón en la Facultad de Medicina (1962)
- El mago de las finanzas (1962)
- La chacota (1962)
- El turista (1963)
- Alias Flequillo (1963)
- De profesión sospechosos (1966)
- La cigarra está que arde (1967), released in English as La Cigarra is on fire.
- Patapúfete (1967)
- Pimienta y Pimentón (1970), released in English as Pepper and Red Pepper
- Balada para un mochilero (1971)
- Todos los pecados del mundo (1972)
- Sujeto volador no identificado (1980)
- Una viuda descocada (1980)