Shneur Zalman Fradkin

Shneur Zalman Fradkin of Lublin (1830–1902), also known as the Toras Chessed (after his main work; תורת חסד "Kindly teaching") or The Liader (after his place of birth), was a famous Chabad posek and gaon. He was a disciple of the third Chabad-Lubavitch Rebbe, Rabbi Menachem Mendel Schneersohn (also known as the Tzemach Tzedek).