Abraham Niederländer
Abraham ben Ephraim Niederländer, also known as Abraham Sofer and the Sofer of Prague, was a 16th-century Jewish-Austrian mathematician. The sofer of Rabbi Judah Loew ben Bezalel, he also wrote Brit Avraham, a work of Jewish arithmetic based largely on Elijah Mizrachi's Sefer ha-Mispar, as well as general mathematics books.