R. Levi ben Gershom (Gersonides, 1288-1344) is one of the greatest and most original figures of Medieval Jewish thought. He wrote numerous works in philosophy, science and biblical exegesis. Some of his scientific works, most notably his highly innovative Astronomy, were translated from Hebrew into Latin and could thus reach non-Jewish scholars. The twelve studies collected in this bilingual volume (English and French in equal parts) offer for the first time a comprehensive overview and assessment of Gersonides' work in astronomy, mathematics, logic, natural science, and psychology....