He was fellow at the Italian Academy for Advanced Studies in America at Columbia University and Associate Research Scholar at the Columbia University, within the research project “Water Diplomacy Initiative at Columbia University” (1999). He has lectured in undergraduate and postgraduate courses at other national and foreign institutions. He has been member of national and international research groups on environmental issues, published a handbook (four editions) and several articles on environmental law, and two books about water law. He has participated in national and international conferences on environmental issues, and has been independent expert for evaluation and review of research programs for the European Commission of the European Union.