FERDINAND SANTOS was Professor of Philosophy at the Archdiocesan Major Seminary, Manila, Philippines, and is presently teaching philosophy and theology at Providence College, Rhode Island, USA. He has published books and articles in philosophy.SANTIAGO SIA is Dean of Philosophy at Milltown Institute (a recognised college of the National University of Ireland), Dublin, Ireland. He was for many years Professor of Philosophy at Loyola Marymount University, Los Angeles. A well established scholar, he has published several books/articles in philosophy of religion, in ethics, and in process thought.