Orthodox rabbi and Jewish law expert who became known for his numerous Halakha-based rulings.
He moved to New York City's Lower East Side in 1936.
He advised the Association of Orthodox Jewish Scientists and became involved in numerous medical ethics cases.
He was born in Uzda, Belarus to a rabbi father. He later married Shima Kustanovich, with whom he had four children.
He was a contemporary of fellow Eastern European-born rabbi and Jewish intellectual, Abraham Heschel.