Hans Küng is a Progressive Swiss Catholic priest, philosopher, theologian and author. Since the 1960s Küng has been engaged in an intellectual battle with former pope, Joseph Ratzinger whom papacy he described as “Modern Inquisition”. Küng’s distinction in Theology academia is due to his rejection of the doctrine of papal infallibility. He has published dozens of book, amongst the most controversial Infallible? An Inquiry (1971), Dying with Dignity (1980), where he explains why euthanasia is not a sin, and My Struggle For Freedom: Memoirs (2003), a criticism of the Modern Church.