Aris Τsangrassoulis is an Associate Professor at the Dept. of Architecture, University of Thessaly. He has received his Msc degree and his PhD in Building Physics from the University of Athens. His research activity focuses on daylighting, the development of techniques for achieving lighting energy savings, , shading and the impact of building design and operation on thermal/visual comfort . He currently runs the Unit of Indoor Environment and Low Energy Building Design, which is involved in national/international research projects while it supports consultancy work in daylighting/lighting design and simulation assisted low energy building design. He has served in various postgraduate programs and research centers and in national and international committees as an expert member.