Thomas à Kempis (1379-1471), a priest, is also the author of The Imitation of Christ, second to the Bible as the best-selling book in Western history.

Thomas Day is the chair of the music department at Salve Regina University where he teaches music and humanities courses. He is an active composer and member of the American Guild of Organists, the American Musicological Society, and the College Music Society, and is the author of Where Have You Gone, Michelangelo?: The Loss of Soul in Catholic Culture. He lives in Newport, Rhode Island.

Thomas H. Groome is professor of pastoral theology and religious education at Boston College. He completed doctoral studies at Columbia University Teacher’s College and Union Theological Seminary in New York. He has lectured widely throughout the world. Professor Groome is author of Christian Religious Education, probably the most widely read and translated book in religious education of the 20th century, and of Sharing Faith, already considered a classic in the field. He is also the principal author of Coming to Faith, a religion curriculum for K-8th grade.

Thomas H. O’Connor is a professor emeritus and a university historian at Boston College. He is the author of Boston A to Z and The Hub: Boston Past and Present. He lives in Boston.

Thomas Keating is the founder of the Centering Prayer movement, an author, a teacher, and a monk who has worked for many years to foster understanding among the world's religions. A member of the Cistercian Order in the Benedictine tradition, he has served at monasteries in Colorado and Massachusetts and currently directs retreats in the practice of Centering Prayer, a cornerstone of contemporary Christian contemplative practice. He is the author of numerous books, including Fruits and Gifts of the Spirit; Manifesting God; Open Mind, Open Heart; St. Therese of Lisieux;...

Thomas Merton is arguably the most influential American Catholic author of the 20th century. He has written more than 60 books and hundreds of poems and articles on topics ranging from monastic spirituality to civil rights, nonviolence, and the nuclear arms race. Some of his most popular titles include New Seeds of Contemplation, No Man Is an Island, The Seven Storey Mountain, Thoughts in Solitude, and Way of Chuang Tzu.

Thomas Schumacher, Dr. theol., is a New Testament scholar and since 2014, he is Professor of New Testament Studies at the University of Freiburg (Switzerland). He was Director of the BIBEL+ORIENT Museum in Freiburg (Switzerland) and Central President of the Swiss Catholic Biblical Association. He specializes in Pauline writings, the New Testament canon, Jewish perspectives in Early Christian scriptures and hermeneutical issues. In the context of these research questions, his focus is on philological, historical-semantic and text-critical aspects.

Tian Dayton has a doctorate in clinical psychology, a masters in educational psychology and is a fellow and Scholar's Award recipient from the American Society of Psychodrama, Sociometry and Group Psychotherapy. She has presented psychodrama to audiences across the United States for nearly two decades, integrating action methods into the fields of mental health and addiction. Dayton serves as director of program development for the Caron foundation and is also the director of the New York PsychoDrama Training Institute at Caron, New York. Dr. Dayton taught psychodrama, sociometry, and group...