His work in the field of music led him to become the assistant to Arturo Toscanini at the Salzburg Festival in 1936 and he also worked in Italy .
Adler was born in Vienna , Austria , to a Jewish family .
Adler 's work in the field of music led him to become the assistant to Arturo Toscanini at the Salzburg Festival in 1936 and he also worked in Italy .
Adler was born in Vienna , Austria , to a Jewish family .