 Ganzfried was considered to be a child prodigy and Ungvar's chief rabbi and Rosh yeshiva, Rabbi Zvi Hirsh Heller assumed legal guardianship; Heller was known as ""Hershele" the Sharp-witted" for his piercing insights into the Talmud.Heller later moved to the city of Bonyhád, and Ganzfried, then fifteen, followed him.He remained in Heller's yeshiva for almost a decade until his ordination and marriage.