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 resided with his father-in-law, was financially aided by him for many years, allowing him to focus on legal studies; he became one of Vilna's prominent Talmudic scholars. After Issachar's demise, Jacob took charge of the city's charities. He passed away in Vilna.