His maternal grandfather was Eliezer ben Nathan (Ra'avan). Eliezer studied under his father Joel haLevi of Bonn, as well as under Judah HeHasid and Judah ben Kalonymus of Mainz.
His maternal grandfather was Eliezer ben Nathan (Ra'avan). Eliezer learned from both his father Joel haLevi in Bonn and from Judah the Chasid and Judah ben Kalonymus in Mainz, contributing to his extensive knowledge base.