Father Roy, STL, PhD, is a priest of the Diocese of Peterborough, Ontario, Canada. He is the principal editor of Benedict XVI and the Sacred Liturgy (Dublin: Four Courts, 2010; Chicago: Scepter, 2011) and former editor of Antiphon: A Journal for Liturgical Renewal. Fr Roy has taught liturgy and sacramental theology at the College of St Mary Magdalen, the University of Notre Dame, and The Catholic University of America. His articles have appeared in The New Catholic Encyclopedia, revised edition (2002), The New Catholic Encyclopedia Supplement 2010, Ephemerides liturgicae, and Antiphon.