Robert Naef was born 19.01.1899 in Feuerthalen (Switzerland) and died 26.08.1936 in Zürich. Unfortunately I could not find anything more about his life and work. There exist several published compositions by him up to op.48, but no other library hold a copy of his Concertino for violin and piano op.1 which was published by Walther Reissbrodt around 1920.