Rabbi Walter Homolka, PhD, DHL, is rector of the Abraham Geiger College for the training of rabbis, executive director of the Zacharias Frankel College, and a professor of Jewish studies at University of Potsdam in Germany. He is author of many books, including The Gate to Perfection: The Idea of Peace in Jewish Thought, coauthor of How to Do Good & Avoid Evil: A Global Ethic from the Sources of Judaism (SkyLight Paths), and a contributor to May God Remember: Memory and Memorializing in Judaism Yizkor and We Have Sinned: Sin and Confession in Judaism Ashamnu and Al Chet (both Jewish Lights).