 He also had positions at the NBC Symphony Orchestra ("Symphony of the Air") (1956), Toronto Symphony Orchestra (1956–57), the Belgrade Philharmonic Orchestra, the Vienna State Opera Orchestra (1959–61) and the Vienna Volksoper.Recordings with the latter included Karl-Birger Blomdahl's opera, "Aniara"; and Sergei Prokofiev’s opera "War and Peace".He returned to the U.S. in the early 1970s.