He lived with his father-in-law, and was supported by him for many years, so that he was able to devote his time to the study of the Law; and he became one of the leading Talmudical scholars in Vilna. After Issachar's death Jacob was appointed trustee of the charities of the city. He died in Vilna.
He lived with his father-in-law and was financially supported by him for many years, which enabled him to dedicate time to legal studies; he became one of Vilna’s leading Talmudic scholars. Following Issachar's death, Jacob assumed the role of trustee for the city's charities. He eventually passed away in Vilna.