Ralph Marcus was born on August 17, 1900, in
San Francisco. His father was Moses Marcus, a Talmudic scholar, and his mother was Selma Marcus, née Neufeld. After the
1906 San Francisco earthquake, his family moved to New York. Marcus studied at
Columbia University and received his BA, Masters, and PhD there. He finished his doctorate in 1927, with his dissertation being "Law in the Apocrypha". In addition to his studies at Columbia, Marcus also worked and studied with
Harry Austryn Wolfson at Harvard from 1925–1927, one of the premier scholars of Hellenic Judaism and Philo of Alexandria of the era. After attaining his doctorate, he acquired a teaching position at
Hebrew Union College – Jewish Institute of Religion, a seminary of
Reform Judaism in New York. He would teach there from 1927–1943, and acquired a professorship in philology in 1935. He also worked as a lecturer at Columbia, his alma mater. In 1943, he left New York for Chicago and joined the
Oriental Institute of the
University of Chicago as an associate professor of Hellenistic culture. He became a full professor there in 1950. In the academic year 1954/55, he served as a visiting professor at
Johann Wolfgang Goethe University in Frankfurt. Marcus died of a heart attack on December 25, 1956, in Chicago. ==Work==