Orthodox pioneers included rabbis and scholars J. David Bleich, Fred Rosner, Avraham Steinberg, Saul J. Berman, Moshe David Tendler, as well as major rabbinic authorities, such as Shlomo Zalman Auerbach, Moshe Feinstein and Eliezer Waldenberg. The reform movement's pioneers included Solomon Freehof, and later involvement by Walter Jacob and Moshe Zemer. Pioneering medical ethicists in the Conservative movement included rabbis Elliot Dorff, David Feldman, Aaron Mackler, Joel Roth, and Avram Reisner, while more recent figures have included Leonard Sharzer.