Gerald O'Collins SJ is Professor of Theology, Gregorian University, Rome.Gerald O'Collins taught theology from 1973 to 2006 at the Gregorian University (Rome), where he was also dean of the faculty (1985-91). In 2007 he became a research professor in theology at St Mary's University College, Twickenham, London. He is the author of countless books including Catholicism (OUP, 2004), Jesus Our Redeemer (OUP, 2007), Jesus: A Portrait (DLT, 2008), The Easter Jesus (DLT, 2008), Incarnation (Continuum, 2002) and Dictionary of Theology (TTC, 2004).Edward G. Farrugia SJ is Professor of Eastern Dogmatic Theology and Eastern Patrology, Pontifical Oriental Institute, Rome.