Dejan Mumovic is a Lecturer in Environmental Design and Engineering at the Bartlett, University College London (UCL), a member of the Complex Built Environment Systems (CBES) research group, and cofounder of IBPSA-England and CIBSE School Design Group. Mat Santamouris is an Associate Professor of Energy Physics at University of Athens and Visiting Professor to the School of Architecture, Low Energy Unit at University of North London, UK. Contributing authors include some of the worlds leading authorities across the field of built environment from the UK, USA, Belgium, Greece, Slovenia, Germany, Serbia, Italy, Denmark and Finland.