For which opera was the teacher of Der Bärenhäuter best known?
Der Bärenhäuter (opera):  As with most of Siegfried Wagner's operas it is more influenced by his teacher Humperdinck than his father Richard Wagner's operas. Engelbert Humperdinck (composer): Engelbert Humperdinck (] ; 1 September 1854 – 27 September 1921) was a German composer, best known for his opera "Hansel and Gretel".
Hansel and Gretel