Soon he spent all his time conducting operas. He conducted in Zürich, Salzburg, Brno and Graz, and got a conductor’s job in Prague and later in Berlin. He conducted the operas of Wagner’s Ring Cycle with great success as well as many performances of "Parsifal". In 1912 he became the conductor of the Boston Symphony Orchestra, and from 1922 until he retired in 1933 he conducted the Hamburg Philharmonic Orchestra.