Kees Roest completed his MSc in medical biology and his PhD in environmental sciences, focused on the microbiological aspects of anaerobic wastewater treatment systems (combining culture-dependent and culture-independent approaches). As a Marie Curie research fellow, he arranged new microbiology laboratories for the investigation of environmental bioreactor processes in Spain (Department of Chemical Engineering and Environmental Technology of the Universidad de Valladolid) and in the UK (Sustainable Environment Research Centre (SERC) of the University of Glamorgan). Currently he is working as senior project manager Water for Clean Energy and Circular Industry at KWR Water Research Institute in Nieuwegein, the Netherlands. His projects focus mainly on innovative wastewater & reuse concepts and technologies. Furthermore, he is also the program coordinator of the KWR water technology projects supported by the Dutch governmental top sector policy.