Lorberbaum was the great-grandson of the Chacham Tzvi, Rabbi Zvi Ashkenazi.
[1] In 1809, he agreed to become the Rav in Lissa (today known as Leszno, Poland), where he enlarged his Yeshiva's enrollment.
[1][3] He was widely respected as a posek, and is one of three authorities on whom Rabbi Shlomo Ganzfried based his rulings in the Kitzur Shulchan Aruch, the well known precis of Jewish law.
His status was such that it is reported that Eiger once fainted when he was honored with an Aliyah in lieu of Rav Yaakov.
[1] Reb Yaakov wrote many works of Torah on Talmud and on Halacha (Jewish law).