Aubrey L. Glazer is senior rabbi of Congregation Shaare Zion and director of Panui, an incubator for contemplative practice and conscious community building. Aubrey's most recent books include Mystical Vertigo (Academic Studies Press, 2013) and Tangle of Matter & Ghost: Leonard Cohen's Post-Secular Songbook of Mysticism(s) Jewish & Beyond (Academic Studies Press, 2017).

Nehemia Polen is Professor of Jewish Thought at Hebrew College, Newton Center, MA. A leading expert in Hasidism and Jewish thought, his books include The Holy Fire: The Teachings of Rabbi Kalonymus Kalman Shapira, the Rebbe of the Warsaw Ghetto (Jason Aronson Inc., first ed., 1977).