Menashe Klein

Menashe Klein, also known as the Ungvarer Rav, was a Hasidic Rebbe and posek. He authored 18 volumes of responsa, spanning over 50 years, entitled Mishneh Halachos. Additionally, he authored some 25 other seforim, including a commentary on Simeon Kayyara's BeHag. Toward the end of his life, he relocated from Brooklyn, New York to Jerusalem.