Rabbi Moshe Schreiber, better known by the name of his book, Chasm Sofer, was a Hungarian Rabbi in the late 18th and early 19th century whose brilliance and leadership helped shape religious Judaism in modern times.

Confronted with the early attempts at religious reformation, modernity and secularism in central Europe, Rabbi Moshe Schreiber, became the leading Jewish religious figure of his day navigating the complexities of preserving Judaism in the face of its many challenges.