Abraham Klausner was a leading Austrian rabbi during the latter part of the 14th century. His principal teacher was Moses of Znaim. He spent much of his life in Vienna where he served as rabbi together with Meir Halevy (1380). Halevy called Abraham Klausner “morenu” (“our teacher”). Klausner was surrounded by well known scholars including Aaron of Neustadt (Blumlein), one of the greatest scholars of Austria who was his brother-in-law. Jacob Moellin (the Maharil) was his student and Klausner was also Isaac Tyrnau’s foremost teacher. Klausner’s reputation is based on his book Sefer ha-Minhagim (Riva di Trento, 1558). This is the first intensive writing about local religious customs. He did not devise the minhagim, but adapted an earlier book, which was written more than fifty years earlier by Hayyim Paltiel. He changed, added his notes and arranged it differently. The editor of Mölln’s Minhage Maharil added in several cases some of the minhagim collected by Klausner. His responsa are referred to by Isserlein in his Pesahim u-Ketabim (No. 6). Klausner also wrote responses to important questions of religion and practice. Rabbi Abraham Klausner died in Vienna around 1407-08.