Max Grunwald

Max Grunwald (born October 10, 1871 in Zabrze, Upper Silesia; died January 24, 1953 in Jerusalem) was a Conservative rabbi in Hamburg and Vienna and author of works on Jewish history and folklore. He was ordained at the Jewish Theological Seminary in Breslau in 1892 and in 1895 began serving as the rabbi of the New Dammthor Synagogue in Hamburg. In 1903, after moving to Vienna he began serving the Turnergasse synagogue, and from 1913, the Leopoldstadt Temple. An erudite scholar, he founded the Society for Jewish Folklore and served as its editor of correspondence until 1929.

https://de.wikipedia.org/wiki/Max_Grunwald