Born in Mexico City in 1907, Joselito Rodríguez developed what was at the time the lightest portable sound equipment, weighing just twelve pounds. The first recordings using his equipment took place in Mexico in 1929, and Joselito Rodríguez began marketing his technology as the Rodríguez Bros. Sound Recording System. He directed his first film in 1940, and subsequently worked on numerous films as director and screenwriter. Joselito Rodríguez died in Mexico City in 1985.