Nathan P. Chase (1990-2025) was assistant professor of liturgical and sacramental theology at Aquinas Institute of Theology in St. Louis, Missouri. He contributed articles to the field of liturgical studies, including pieces on liturgy in the early Church, initiation, the Eucharist, inculturation, and the Western Non-Roman Rites, particularly the Hispano-Mozarabic tradition. With Maxwell E. Johnson, he co-authored The Apostolic Tradition: Its Origins, Development, and Liturgical Practices (Liturgical Press, 2025), and The Origins of the Canons of Hippolytus (Liturgical Press, 2024). He was the author of The Homiliae Toletanae and the Theology of Lent and Easter (Peeters, 2020) and The Anaphoral Tradition in the 'Barcelona Papyrus' (Brepols, 2023). Maxwell E. Johnson is emeritus professor of liturgy at the University of Notre Dame and a retired presbyter in the Evangelical Lutheran Church in America. His numerous publications are on the origins and development of early Christian liturgy, contemporary rites, and current ecumenical and theological questions in both East and West. He is the author and/or editor of more than twenty books and over one hundred essays and articles. He is also a former president of the North American Academy of Liturgy, a member of the Society of Oriental Liturgy, a member of Societas Liturgica, and a member of the scientific advisory board for the journal Ecclesia Orans.