Leo was interned in Dachau concentration camp from 11 November to 7 December 1938, and emigrated to England in 1939.
Arriving in New York in 1947, he was, according to Das Schicksal der jüdischen Rechtsanwälte in Bayern nach 1933, by Reinhard Weber, unsuccessful in business and died there in 1952, aged 67.
[3] After making his Carnegie Hall debut at age 23, he came under the tutelage of Leonard Bernstein, eventually taking over as music director of the Broadway production of West Side Story.
In 1984, he became Music Director of the Charleston Symphony Orchestra; a position he remained in until his death 26 years later.
[5] He was also involved in the staging of a notable production of Gershwin's Porgy and Bess in Charleston, the city where the opera is set, which went on to tour internationally in the early 1990s.