Years: 1745–1823
Primary city: Paks
Rabbi Yitzchak Eizik Greishaber was a Polish-Hungarian rabbi and posek who served as the rav of Paks. His work Makel Noam articulated a firm opposition to liturgical and doctrinal innovations, particularly those espoused by Rabbi Aharon Chorin of Arad. Through this sefer and his communal leadership, he helped define the boundaries of halachic change in the Hungarian rabbinate.