He studied at ICCROM, received an M.A from the University of York, and served as assistant to Sir Bernard Feilden in Rajasthan and Bahrain. As a consultant to UNESCO, ICCROM, the Getty Conservation Institute and the World Monuments Fund, he has been engaged in various World Heritage sites, among them Templete Mudéjar in Guadalupe (Spain), a project that was awarded the Europa Nostra Prize. In Italy he directed the conservation of the façade of Parma Cathedral, designed experimental shelters for Herculaneum and the new roof over the mosaics of Piazza Armerina in Sicily. He has taught conservation design studios at the University of Pennsylvania and architectural conservation history and theories at the University of Milan. He has published on the technical, historical and theoretical aspects of conservation.