Rabbi Abraham of Kalisk (1741- 1810) was a prominent Chassidic Rebbe of the 3rd generation of Chassidic Leaders. He was a disciple of Rabbi Dov Ber, The Great Maggid of Mezeritch who was the successor of Rabbi Israel Baal Shem Tov- The BESHT.
In his youth, Rabbi Abraham was a study partner of Rabbi Elijah, The Vilna Gaon, who became the leader of the opposition against Chassidic Judaism- the Misnagdim.
Rabbi Abraham and his Chassidim were prominent among the Chassidic movement with their emotional approach towards the service of G-d and their opposition against the intellectual elitism of the establishment's scholars (Misnagdim). After the Passing of The Great Maggid, the most of the opposition against Chassidism was directed against Rabbi Abraham and his disciples.
In 1777 Rabbi Abraham joined the fist chassidic aliyah under the leadership of Rabbi Menachem Mendel of Vitebsk and emigrated to The Holy Land. He passed away in Tiberias on the 4th of Shevat of the year 5570 from cration (1810 CE).
About Rabbi Abraham of Kalisk on The Jewish Encyclopedia http://www.jewishencyclopedia.com/view.jsp?artid=57&letter=K