He conducted several Romanian premieres of notable foreign masterpieces, such as Die Meistersinger von Nürnberg and Der Rosenkavalier.

[4] They were held under house arrest, or according to some sources, sent to Mariapfarr concentration camp, until the end of World War II.

[1] After the Second World War, he conducted mostly in Italy, notably at La Scala in Milan (1947–1952; his first appearance there was in Samson et Dalila).

For the 1949–1950 season he was guest conductor at the Metropolitan Opera, giving performances of works such as Tristan und Isolde, Rigoletto, La traviata, and Carmen.

Following a heart attack and a stroke in 1957, he learned to conduct with his left arm only, and preferred to concentrate on giving concerts and making records.