Berlin. Playwrights like Carl Sternheim, Arthur Schnitzler, Ernst Toller, Erwin Piscator, Walter Hasenclever, Ferenc Molnár and Carl Zuckmayer, and influential producers like Max Reinhardt, appeared at times to dominate the stage, which tended to be modishly left-wing, pro-republican, experimental and sexually daring. But it was certainly not revolutionary, and it was cosmopolitan rather than Jewish. Jews also made similar, if not as massive, contributions to theatre and drama in Austria, Britain, France, and Russia (in the national languages of those countries). Jews in Vienna, Paris and German cities found cabaret both a popular and effective means of expression, as German cabaret in the Weimar Republic "was mostly a Jewish art form". The involvement of Jews in Central European theatre was halted during the rise of the Nazis and the purging of Jews from cultural posts, though many emigrated to Western Europe or the United States and continued working there. English-language theatre In the early 20th century the traditions of New York's vibrant Yiddish Theatre District both rivaled and fed into Broadway. In the English-speaking theatre Jewish émigrés brought novel theatrical ideas from Europe, such as the theatrical realist movement and the philosophy of Konstantin Stanislavski, whose teachings would influence many Jewish-American acting teachers such as the Yiddish theatre-trained acting theorist Stella Adler. Jewish immigrants were instrumental in the creation and development of the genre of musical theatre and earlier forms of theatrical entertainment in America, and would innovate the new, distinctly American, art form, the Broadway musical. Brandeis University Professor Stephen J. Whitfield has commented that "More so than behind the screen, the talent behind the stage was for over half a century virtually the monopoly of one ethnic group. That is... [a] feature which locates Broadway at the center of Jewish culture". New York University Professor Laurence Maslon says that "There would be no American musical without Jews… Their influence is corollary to the influence of black musicians on jazz; there were as many Jews involved in the form". Other writers, such as Jerome Caryn, have noted that musical theatre and other forms of American entertainment are uniquely indebted to the contributions of Jewish-Americans, since "there might not have been a modern Broadway without the "Asiatic horde" of comedians, gossip columnists, songwriters, and singers that grew out of the ghetto, whether it was on the Lower East Side, Harlem (a Jewish ghetto before it was a black one), Newark,