Having practiced in Ireland, Canada and the United Kingdom, he worked at the Energy Research Group in the School of Architecture, University College Dublin from 1986 to 2002. His work involved the management of research and dissemination activities promoting energy-efficient, ecologically conscious architecture and building construction throughout the European Union and Eastern European countries. His work has involved the production, as author or editor, of numerous conference papers, books, articles, brochures, presentations, lectures, videos, TV programmers and software packages. He is chairman of the Sustainability Task Force of the RIAI (Royal Institute of the Architects of Ireland).