Prof. Johannes P. Maree, Pr.Sci.Nat., is a Research Professor at the Institute for Nanotechnology and Water Sustainability (iNanoWS), University of South Africa, and founder and director of ROC Water Technologies. He has extensive research and industrial experience in mine-water and industrial wastewater treatment, with particular interests in acid mine drainage, neutralisation, desalination, freeze crystallisation, evaporation, mineral and salt recovery, and the beneficial use of industrial waste heat. His research focuses on developing and scaling sustainable processes that convert wastewater and waste streams into sources of reusable water and valuable products. Technologies developed through his research have progressed from laboratory studies to pilot, demonstration, and industrial application. He is an NRF C2-rated researcher and a registered Professional Natural Scientist (Pr.Sci.Nat.). His contributions to water-treatment technology have received recognition including the CSIR Business Award and the Umgeni Water Award.