Günther Rennert  Günther Rennert (1 April 1911 – 31 July 1978) was a German opera director and administrator. 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 Opera of Frankfurt (Oder). Subsequently, he worked in Königsberg (1939), Berlin (1942), Munich (1945), Hamburg (1946), Glyndebourne (1959) and many other opera houses. He died in Salzburg, Austria.