Jacob Katz
Jacob Katz (Hebrew: יעקב כ"ץ) (born 15 November 1904 in Magyargencs, Hungary, died 20 May 1998 in Israel) was an acclaimed Jewish historian and educator.Katz described "traditional society" and deployed sociological methods in his study of Jewish communities, with special attention to changes in halakhah (Jewish law) and Orthodoxy. He pioneered the modern study of Orthodoxy and its formation in reaction to Reform Judaism.
In his youth he pursued both religious and secular studies, receiving rabbinic ordination and a doctorate in social history. Provided by Wikipedia
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