Short answers, pulled from the story.
Max Reinhardt was an Austrian-born theatre and film director, born Maximilian Goldmann on the 9th of September 1873 in Baden bei Wien, who died on the 30th of October 1943. He is regarded as one of the most prominent stage directors of the early twentieth century, credited with introducing Expressionism into theatre and film and with co-founding the Salzburg Festival in 1920.
Reinhardt co-founded the Salzburg Festival in 1920 alongside composer Richard Strauss and playwright Hugo von Hofmannsthal. The inaugural production was Hofmannsthal's adaptation of the Medieval Dutch morality play Everyman, staged in the square before Salzburg Cathedral with the Alps as backdrop. This production has remained an annual custom at the festival to the present day.
The Nazi Ministry of Propaganda under Joseph Goebbels banned the film because of the Jewish ancestry of director Max Reinhardt, classical composer Felix Mendelssohn whose music was used throughout, and soundtrack arranger Erich Wolfgang Korngold, whose work Goebbels had classified as degenerate. Goebbels also viewed Expressionism itself as degenerate art.
Reinhardt's world premiere of Reinhard Sorge's Kleist Prize-winning play Der Bettler on the 23rd of December 1917 is credited with giving birth to Expressionism in the theatre. The production used wholly Expressionist staging techniques, including lighting that functioned like consciousness, and its influence spread immediately to other German cities and later to motion pictures.
Reinhardt purchased Schloss Leopoldskron near Salzburg in 1918. The Nazis seized it following the Anschluss annexation of Austria in 1938. After the war, the castle was restored to his heirs and later became known as the filming location for the early garden scenes of the movie The Sound of Music.
The Max Reinhardt Workshop on Sunset Boulevard trained students including Alan Ladd, Jack Carson, Robert Ryan, Gower Champion, Shirley Temple, Angie Dickinson, and Cliff Robertson. Reinhardt acquired the original Ben Bard Drama playhouse on Wilshire Boulevard by winning it from Ben Bard in a poker game.