Reb Levi Yitzchok was known as the "defense attorney" for the Jewish people, because it was believed that he could intercede on their behalf before God. Known for his compassion for every Jew, he was therefore one of the most beloved leaders of Eastern European Jewry. He authored the Hasidic classic Kedushas Levi, which is a commentary on many Jewish religious books and laws, and is arranged according to the weekly Torah portion. He is considered by some to be the founder of Hasidism in central Poland.
He had three sons. The oldest one, Maier, died at a young age. The second one, Israel, succeeded his father as leader of the Hasidic movement. One of Rabbi Levi Yitzchok's grandsons married the daughter of Dovber Schneuri, the Second of the Chabad Rebbe's and the first Chabad Rebbe to live in Lubavitch.