Rennert was born in Essen, Rhine Province. Starting as a film director in 1933, he then became involved in the operatic theatre, becoming an assistant to Walter Felsenstein at the Oper Frankfurt (Frankfurt Opera). Subsequently he worked in Königsberg (1939), Berlin (1942), Munich (1945), Hamburg (1946), Glyndebourne (1959) and many other opera houses. He died in Salzburg, Austria.
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