Leo Portnoff (1875-1940) was a Ukranian-born composer violinist and pedagogue. He studied with Joachim and Wirth in Berlin before teaching at the Klindworth-Scharwenka Conservatory and later becoming a professor at the Stern Conservatory. After the First World War he became a conductor before moving to America in 1922 where he remained for the rest of his life eventually becoming Head of Viol…