Author of Arba'ah Turim, a codex of Jewish law and a Torah commentary commonly referred to as "Ba'al ha-Turim". This commentary itself is prefaced by a brief commentary in itself, and this work has gained great influence to the point that it is printed in many one-volume Torah texts for synagogue use, only next to Rashi and Onkelos. It contains mystical and symbolical references in the Torah text, often using gematria and acronyms as well as other occurrences of particular words elsewhere in the Torah.