Kees Roest has worked at KWR since 2008 and stood at the forefront of the KWR wastewater research. On the Industry, Wastewater and Reuse team, he works on innovative wastewater purification concepts and technology and the reuse of water, energy and components such as nutrients, cellulose and metals. His research activities used to be mainly fundamental, e.g. his PhD research on environmental microbiology at WUR or coaching PhD students at KWR. Currently Kees’s work is increasingly applicational. Examples include the recently completed struvite collection pilot at Schiphol (TKI Sustainable Airport Cities), small-scale loop closure (TKI Cleantech Playground North Amsterdam) and the current cellulose collection at WWTP Aarle Rixtel (Screencap EU project). In addition to being a researcher and project manager, Kees is also a coordinator of the KWR TKI (Top Consortium for Knowledge & Innovation) Water Technology Programme. Every year, KWR starts around 15-20 TKI projects in consultation with end users and businesses and has done so since 2013. In these roles, Kees has contact with many organisations in the Netherlands and abroad from small to large companies to universities and government organisations. For example, he founded the European Innovation Partnership on Water Action Group ARREAU (Accelerating Resource Recovery from the watercycle) in collaboration with AquaMinerals (the Netherlands), the Energy & Raw Materials Factory (the Netherlands), KWB (Germany), CirTec (the Netherlands) and IVL (Sweden) to exchange knowledge and skills in reuse of components from the watercycle. Kees Roest plays an important role in setting up new projects, but also in the successful execution and completion of these projects.