Prof. Kai Witthüser has more than 23 years of experience in hydrogeology, specializing in mining related environmental impact assessments, hydrogeological and geochemical modelling. Kai lectured at the University of Bonn (Germany) and Pretoria (South Africa), before joining Water Geosciences Consulting as a director and groundwater specialist in 2006 (the company merged later with Metago and SLR Africa) and starting Delta h Water Systems Modelling in 2012. He is Affiliated Professor at the Institute for Groundwater Studies, University of the Free State since 2009. Countries of work experience include Austria, Benin, Botswana, Democratic Republic of Congo, Denmark, Germany, Ghana, India, Israel, Morocco, Namibia, Slovenia, South Africa, Tanzania and Zimbabwe.