Born in Buenos Aires into a Jewish family in 1913 as Isaac Rosofsky, he became famous as an adult with the pseudonym Julio Jorge Nelson.
Immersed since childhood in the theatrical environment and in the emerging world of radio, at fourteen he decided not to study further, a decision that earned him being thrown out of the house by his parents.
Soon after, on Radio Callao, opened in January of that year, the announcer Carlos Enrique Cecchetti began broadcasting a program fully devoted to Gardel.
In 1936, he married Margarita Ibarrola Isaurralde when she was 17, but they separated in 1945, leaving his 7-year-old son, Julio Carlos (nicknamed "Cachito") with the boy's paternal grandparents.
He immediately phoned Buenos Aires, and shortly after, via a link to a radio Guayaquil, Julio, asked the son to come back home.
This tango was recorded by Alberto Gómez in 1935, but truly became famous due to the version of Miguel Caló with Raul Beron, in 1942, which was followed by Aníbal Troilo with Fiorentino, in 1943.
Nelson was also the author of the tangos "Carriego”, “Óyeme, mamá”, “Qué será de ti”, “No debemos retornar”, “Nocturno de tango”, “La casa vacía”, “Escuchando tu voz”, “Al volverte a ver”, “Junto al piano”, “Cuento azul”, and “Derrotao”, among others.