Rabbi Marcus Mordecai Jastrow

Marcus Jastrow, was one of the leading Rabbis, Talmudic scholars, and Jewish educators in America at the turn of the century, and he was also distinguished by an heroic past of fighting for human rights in mid-nineteenth century Poland. His life history is listed in most encyclopedia of Jewish history. This charismatic family patriarch had been an effective crusader for social and moral causes both within and outside of the Jewish community. He had groomed his two sons (Joseph and Morris) for the rabbinate, raising them in a literate, articulate, and socially aware environment. Both sons, however, eventually fell into conflict with their distinguished and strong-willed father. Both left the congregation Rodeph Shalom in Philadelphia to devote their lives to the academic world. Morris received a Ph.D. in Semitic languages from Leipzig and went on to a distinguished academic career at Penn. Joseph strayed further and abandoned his father's religion altogether.

http://en.wikipedia.org/wiki/Marcus_Jastrow