Kevin W. Irwin is a priest of the Archdiocese of New York. Serving on The Catholic University of America faculty for over thirty years, Monsignor Irwin held the Walter J. Schrnitz Chair of Liturgical Studies from 2000-2015, served as the dean of the School of Theology and Religious Studies from 2005-2011, and currently holds the position of ordinary research professor. He is the author of several books, including: On Caring for Our Common Home: The Encyclical Letter Laudato Si'; What We Have Done, What We Have Failed to Do: Assessing the Liturgical Reforms of Vatican II, and The Sacraments: Historical Foundations and Liturgical Theology (all published by Paulist Press).