הרב יצחק מאיר אלתר

Yitzchak Meir Rotenberg-Alter ‎(1799 – 10 March 1866), was the first Rebbe of the Ger Hasidic dynasty, which he founded in the town of Góra Kalwaria, Poland. He headed the Kupath Rabbi Meir Baal Haness Kollel Polen (Poland) Varsha (Warsaw). He was also known as The Chiddushei HaRim for his Torah writings, and was sometimes fondly called Reb Itche Meir (Yiddish) by his followers.