Christos Roumpos, PhD, holds an MSc in mining engineering, an MSc diploma in energy and environmental management, and a PhD in mine planning and mining economics. Since 1991, he has worked mainly in the fields of mining engineering and mineral and energy economics. For about 20 years, he has taught surface mining, mine planning and design, project management, mineral economics, and investment analysis at the National Technical University of Athens and the Technical University of Crete. He is the author and co-author of more than 100 papers in scientific journals and international conferences.