Peter Tarleton Stewart has acted as a chaplain in schools, prisons, hospitals, and a university. He also has worked as a parish clergyman in Cork, Dublin, Cootehill, Killeshin, and Portlaise, retiring in 2020 after 46 years as an Anglican priest. He has always been actively interested in politics, recognizing how it often serves the interests of the few to the exclusion of the most vulnerable. As a Christian he sees the world as a place in which to be actively involved. He has called on the church to be bold in its service to humanity, and respectful in its care of the Earth.