Claude Alain Roulet is a building physicist with almost 50 years of experience in materials and energy. He has been a researcher and Professor in the Institute of Technology in Lausanne and has worked not only on thermal insulation materials, but also on ventilation systems and indoor environmental air quality. Roulet assisted the Swiss Federal Government in enforcing testing and quality assurance mechanisms for building materials, particularly thermal insulation materials. He has published several books and manuals on energy-efficient building design.