Peter M. Kalellis is a psychotherapist; a marriage and family therapist; and the author of Five Steps to Spiritual Growth, Restoring Relationships, and Restoring Yourself. He lives in Mountainside, New Jersey.

Peter Kalellis was born in Philadelphia in 1926, but grew up in Greece on the island of Lesbos, where he endured the Nazi occupation. He returned to America in 1946, where he earned advanced degrees in education and psychology from Princeton University and the Andover Newton School of Psychology. He is the author of many books on psychology and Eastern Orthodox spirituality.

Peter H. Van Ness, formerly Dean of Academic Affairs at Union Theological Seminary, New York City, and currently Visiting Associate professor of Religion at Columbia University, is the author of Spirituality, Diversion, and Decadence: The Contemporary Predicament.

Phil F. Lawler is the editor of Catholic World News and the author of The Alternative Influence: The Impact of Investigative Reporting on American Media and The Faithful Departed: The Collapse of Boston's Catholic Culture. He lives in South Lancaster, Massachusetts.

Philip Kaufman, a Benedictine monk for over 65 years, lived at Saint John's Abbey in Collegeville, Minnesota, and spent many years of his life giving comfort to Catholics through workshops on topics derived from his books. Father Philip, born in 1911, continued to write on controversial subjects including the formation of the New Testament until his peaceful death at Collegeville on January 8th, 2008.

Philip Wexler was emeritus Professor of Sociology and Unterberg Chair in Jewish Social and Educational History at the Hebrew University of Jerusalem. He previously served as Dean of the Margaret Warner Graduate School of Education and Human Development at the University of Rochester, NY (1989-2000), and as Director of the School of Education at the Hebrew University of Jerusalem (2002-2010). He served as Visiting Professor at Brandeis University (2010-2012) and at the University of Wuppertal, Germany (2012-2014).

Phyllis Zagano is a founding cochair of the Roman Catholic Studies Group of the American Academy of Religion—the world’s largest society of scholars of religion—and author or editor of fifteen other books. She holds five academic degrees and has taught at major universities on the East Coast.

Pierre-Marie Emonet, O.P., was a professor of philosophy at the Seminaire International d'Ars in France.