Rabbi Mordechai Willig is the Av Beth Din of the Beth Din of America. He also serves as the Rabbi Dr. Sol Roth Professor of Talmud and Contemporary Halachah and Segan Rosh Kollel of the Kollel L’Horaah Yadin Yadin at the Rabbi Isaac Elchanan Theological Seminary of Yeshiva University. Since 1974, Rabbi Willig has been the rabbi of the Young Israel of Riverdale in Riverdale, New York. He is the author of the four volume Am Mordechai series.