Bayreuth Festival the world of opera. Other notable directors to have participated in "Werkstatt Bayreuth" included Jean-Pierre Ponnelle, Sir Peter Hall of the Royal Shakespeare Company, Götz Friedrich of the Deutsche Oper Berlin, Harry Kupfer of the Berlin State Opera in the former communist East Germany and Heiner Müller of the Berliner Ensemble. In the end, Wolfgang's decision to bring in experimental directors helped rejuvenate Bayreuth and restore its reputation as the world leader in Wagnerian opera. There was uncertainty over how the Festival was to be managed after the retirement of Wolfgang Wagner at the end of August 2008. In 2001,
Bayreuth Festival the festival into an opportunity for directors to experiment with new methods for presenting the operas. The change came out of necessity, as it was impossible for Wolfgang to both administer and direct the festival. It also provided an opportunity for Bayreuth to renew itself with each production, rather than continue to present the same operas in the same way, year after year. Ingmar Bergman, who famously made a film version in Swedish of Mozart's "Die Zauberflöte", turned down an invitation to direct the festival. The most sensational production in "Werkstatt Bayreuth" was the Centennial Ring Cycle under the direction