Konstantinos Modis, Ph.D., Professor of Geostatistics at the National Technical University of Athens, is a Mining and Metallurgical Engineer with more than 30 years of academic and industrial experience in Earth Sciences. He served the private sector as a resources engineer, mainly in mixed sulphide ore exploitations and as a consultant in industrial and mining investment projects. He also served as a referee of national research programs and many international research journals. He is actively involved in a number of research projects relevant to the Exploration and Estimation of Mineral Resources, Geological and Ground Water Modeling and Mathematical Optimization. He is the writer of two books and more than 50 publications in international journals and conferences.