Antonio José Gutiérrez Trashorras received a Ph.D. Degree in Mechanical Engineering from the University of Oviedo, Gijón, Spain, in 2007. Since 2005, he has been a Lecturer with the Department of Energy, Heat Engines Area, University of Oviedo. Currently, he is Head of the Energy Department at Oviedo University. His main lines of research focus on energy efficiency and renewable energies. He has published more than 90 articles in JCR-indexed journals and papers presented at international and national Conferences, five books of theory and problems on Thermal Engineering as a single author and two parts of research books published by international editors. Dr. Gutiérrez Trashorras was awarded the research prize “Mieres del Camino” for his B.A. dissertation. He was the Director of his own Technical Engineering Office for over five years, and he has taken part in more than 40 regional, national, and European research projects and contracts, most of them competitive.