Hans Boersma holds the J. I. Packer Chair in Theology atRegent College, Canada, and is co-director (with Matthew Levering)of the Center for Catholic-Evangelical Dialogue. As well as thisvolume and a forthcoming publication on Gregory of Nyssa, he is theauthor of Heavenly Participation: The Weaving of a SacramentalTapestry (2011), Nouvelle Theologie andSacramental Ontology: A Return to Mystery (2009), andViolence, Hospitality, and the Cross: Reappropriating theAtonement Tradition (2004). Prof Boersma is a member of theLangley Immanuel Christian Reformed Church. Matthew Levering is Professor of Theology at theUniversity of Dayton, USA, where he is also director of the Centerfor Scriptural Exegesis, Philosophy, and Doctrine. Co-editor since2003 of the theological journal Nova et Vetera, he has alsorecently joined the editorial team of the International Journalof Systematic Theology. Prof Levering has served as Chair ofthe Board of the Academy of Catholic Theology since 2007 andco-directs the Center for Catholic-Evangelical dialogue alongsideProf Boersma. His numerous books and publications include mostrecently The Feminine Genius of Catholic Theology (2012),Jesus and the Demise of Death (2012), andPredestination (2011). Forthcoming publications includevolumes on St. Paul and Thomas Aquinas and on the theology ofAugustine.