In 1830, he abandoned commerce and accepted the position of Rabbi of Brezovica (Brezevitz). In 1849, he returned to Ungvar as a dayan, a judge in the religious court. At that time Ungvar's spiritual head, Rabbi Meir Ash, was active in the Orthodox camp, in opposition to the Neologs. Through serving with Ash, Ganzfried realised that in order to remain committed to Orthodoxy, "the average Jew required an underpinning of a knowledge of practical halakha (Jewish law)". It was to this end that Ganzfried composed the "Kitzur Shulchan Aruch." This work became very popular, and was frequently reprinted in Hebrew and in Yiddish. This work often records more stringent positions.