Karaite ḥakam; born at Lutzk in 1785; died at Eupatoria, in the Crimea, before 1878. He was one of the most prominent scholars of the Karaite sect during the nineteenth century. He officiated as ḥakam of Lutzk (in succession to his father), and later at Eupatoria. He wrote a Hebrew grammar entitled "Petaḥ Tiḳwah" (Eupatoria, 1857), and "Sefer Tetib Da'at" (ib. 1858), directed against rabbinical philosophy and Ḥasidic mysticism, and endeavoring to explain Biblical angelology.