Fr. Mark G. Boyer, a retired priest of the Diocese of Springfield-Cape Girardeau, Missouri, is the author of fifty books, including three editions of The Liturgical Environment, on biblical and liturgical spirituality. He continues as a part-time instructor in the Religious Studies Department of Missouri State University, Springfield, where he has taught courses in New Testament and Bible and Film for twenty-eight years. His other books include the following titles: Praying Your Way through Luke’s Gospel and the Acts of the Apostles, An Abecedarian of Animal Spirit Guides: Spiritual Growth through Reflections on Creatures, and Overcome with Paschal Joy: Chanting through Lent and Easter—Daily Reflections with Familiar Hymns.