Yekusiel Yehuda III Teitelbaum, known by the Yiddish colloquial name Rav Zalman Leib (born 23 December 1951), is one of two Grand Rebbes of Satmar, and the son of Grand Rabbi Moshe Teitelbaum, the late Rebbe of the Satmar Hasidim. He is the son-in-law of the previous Bistritzer Rebbe of Brooklyn. He is currently one of the two Grand Rebbes of Satmar, with his faction being based in central Satmar congregation in Williamsburg, and the Dean of a Satmar yeshiva in Queens. In 2007, Newsweek named him the 15th most influential rabbi in America.