Rabbi Chananya Yom Tov Lipa Deutsch; 1908 - 1990 was a Rebbe and the head of the rabbinical court (Av Beit Din) in Helmec. He was a renowned expert in halachic issues related to mikvaot (Jewish ritual baths) and a well-known halachic authority. Rabbi Deutsch authored the work Taharat Yom Tov, which focuses on the laws and construction of mikvaot.
His expertise and rulings on mikvaot were highly regarded across Jewish communities, and his works continue to be a key reference for scholars and rabbis dealing with the laws of ritual purity and mikveh construction.