 On New Year's Eve 1923 he played in Carnegie Hall as an accompaniment for Jascha Heifetz annual solo violin performance.For the next ten years, he served as Heifetz's principal accompanist, recording an extensive discography and performing chamber and solo recitals in major music centers all over the world.In 1933 he ended his association with Jascha Heifetz and on November 10, 1933 he appeared at Carnegie Hall as solo pianist.