Kay Künzel is the conceptual and formative head of the architecture office "raumfürarchitektur” (space for architecture) in Wachtberg near Bonn in Germany. He is dedicated to green and energy efficient architecture. During his university studies he planned the highly respected project St.Gereons Estate, the first Passive House settlement in the Rhineland; a completely sustainable and ecological project fully provisioned by renewable energy. Today he is a well-known and appreciated specialist in Passive House design, especially in calculating building physics and developing high efficient building services. As a project manager, he supports numerous national and international projects with the mission "high energy efficiency combined with green architecture". For the past seven years, he has been a lecturer at various academies in Germany and Austria which offer advanced training for the “Certified Passive House Designer”. He has also created a special training course for "certified passive house craftsmen". He has been a lecturer since 2010 at the Danube University in Krems / Austria at the Department of “Future Building Solutions” in the International Master’s Program for Sustainable Building Design.