Yechiel Yaakov Weinberg was born in Ciechanowiec, which was then part of the Russian Empire and now located in
Poland. He studied at the
yeshivas of
Mir and
Slabodka. In the latter, "he combined within himself Lithuanian profound understanding of
Halacha with the Slabodka
musar expounded by the illustrious Alter, Rabbi
Nosson Tzvi Finkel." In 1906 he married 16-year-old Esther Levine, daughter of the deceased Rabbi Yaakov Meir of Pilvishki. They would later divorce and Weinberg would remain single. He also became rabbi of this city, both the spiritual rabbi and
crown rabbi, and served for seven years. At the outbreak of
World War I, he went to
Germany. There he studied at the
University of Giessen. His doctoral research on
Targum was supervised by
Paul E. Kahle. Weinberg "championed" this approach during his tenure at the Hildesheimer seminary, and he "played and was to play a seminal part in the reconciliation of Torah orthodoxy with modernity." His "melding of sources, methods, and worlds was unparalleled in modern halachic literature. It required breadth and depth of knowledge that were, and remain, rare." In 1939, he fled
Nazi Germany, and became trapped in the
Warsaw Ghetto, where he was a prominent leader. Because of his Russian citizenship, the Germans imprisoned him together with Russian prisoners of war, enabling him to avoid the concentration camps and to survive the war. After the war, a loyal student, R. Shaul Weingort, brought him to
Montreux,
Switzerland, where he lived until his passing in 1966. Despite many offers of prominent rabbinic positions across the globe, Weinberg chose not to leave Switzerland, where he penned many influential and important responsa. ==Works==