Prof. Dr. Walter Frenz studied law at the universities of Würzburg, Caen (Maîtrise en Droit public) and Munich; 1st and 2nd state examinations, doctorate in 1991. Since 1997, he has been a university professor at RWTH Aachen University, where he is head of the teaching and research area of mining, environmental and European law. Prof. Dr. Axel Preusse studied mine surveying at Technical University of Clausthal, at Technical University of Berlin and at Liaoning Technical University/PRC; 2nd state examination at Mining Authority NRW, doctorate in 1990. Since 1997 he holds the Chair of the Institute for Mine Surveying, Mining Subsidence Engineering and Geophysics in Mining at RWTH Aachen University. At present he is Vice-Dean of the Faculty of Georesources and Materials Engineering.