Oskar Ewald

His father was Moritz Friedländer, a liberal scholar of Judaism who worked with the Jewish community of the Kingdom of Hungary on matters including the expansion of education.
Beginning in 1901, Ewald was a member of a group of young intellectuals in Vienna, . In addition to Ewald, this group included Otto Weininger, Arthur Gerber, , , and .
Ewald converted to Protestantism and changed his last name to Ewald. Provided by Wikipedia