In the town of Halberstadt, Germany, over 100 years ago, lived the gaon, Rav Binyamin Tzvi Auerbach zt”l. He grew up in France and served as a rabbi in Darmstadt for ten years after earning s’michah as well as a PhD in philosophy and Semitic languages. While living in Frankfurt, Rav Auerbach wrote the sefer Bris Avraham in memory of his father, and also spent much of his time editing Sefer HaEshkol, written by the Raavad of Norvona in the 13th century. Years later, when he became the Rav of Halberstadt, he published his work as a commentary named Nachal Eshkol.