Diarmuid O'Murchu, a priest, member of the Sacred Heart missionary order, and a graduate of Trinity College in Dublin is a social psychologist most of whose working life has been in social ministry, predominantly in London. As a psychologist and priest he has counseled couples, the bereaved, those with AIDS-HIV, the homeless, and refugees. As a workshop leader and group facilitator he has worked in Europe, the United States, Canada, Australia, the Philippines, Thailand, India, Peru, and in several African countries, facilitating programs on adult faith development.

His best-known books include Quantum Theology, Reclaiming Spirituality, Catching Up with Jesus, Jesus in the Power of Poetry, and Christianity's Dangerous Memory.