Lucas Francisco Mateo-Seco, Ph.D (1969) in Theology (Angelicum, Rome), is Professor Emeritus of Dogmatic Theology of the University of Navarre (Spain). His publications, the results of 40 years of work, cover the entire spectrum of Gregory of Nyssa's thought. Giulio Maspero, Ph.D. (1999, 2003) in Physics (Milan, Italy) and in Theology (Pamplona, Spain), is presently Associate Professor of Systematic Theology at the Pontifical University of the Holy Cross (Rome). He has published on Gregory of Nyssa's Trinitarian doctrine.