Author of the Chassidic classic "Degel Machaneh Ephraim." He was a son of the Baal Shem Tov's daughter Udel, and brother of R' Baruch of Medzhybizh. (His sister Faiga was the mother of R' Nachman of Breslov.) After his grandfather's death, he studied under the Maggid of Mezeritch and R' Jacob Joseph of Polonne. In 1780, he settled in Sudilkov (near Shepetivka) where he served as Maggid until 1785. He then returned to Medzhybizh and served as Rebbe there until his death in 1800. He is buried next to his grandfather, the Baal Shem Tov, in Medzhybizh.