Adnan SÖZEN is Professor in the Department of Energy Systems Engineering at the Faculty of Technology of Gazi University. He obtained his M.Sc. and Ph.D. in Mechanical engineering from the Gazi University. His research field lies in the area of environmental and energy. He is working on applications of efficiency analysis, renewable energy technologies, solar heating/cooling systems,energy systems, environmental efficiency, data envelopment analysis and artificial intelligence applications. Professor SÖZEN has published more than 120 papers in reputable academic journals(70 of them are covered by SCI articles) and conferences.