Loet Rosenthal is the manager of KWR’s Water Quality & Health Research Group and a member of the institute’s Management Team. He holds ultimate responsibility for KWR’s leading chemical and biological laboratories. Within the framework of KWR’s status as a WHO Collaborating Centre on Water Quality and Health, Loet’s research group fulfils the role of test laboratory for Household Water Treatment Systems. Thanks in part to the intensive collaboration between its researchers and labs, KWR is able to act as a national centre of expertise regarding water-related challenges of importance to society. Loet works with his colleagues on strengthening KWR’s profile in water-related public health and circular economy issues, both nationally and internationally. This also involves developing contacts with water utilities, governments, colleague water labs and other, largely public, partners. Prior to joining KWR in 2017, Loet was Drinking Water Sector Manager and MT member at PWN Waterleidingbedrijf Noord-Holland; besides the drinking water portfolio, Loet also headed up the managerial collaboration in the urban watercycle. Up until his departure from PWN, Loet was also director of the Watertransportmaatschappij Rijn-Kennemerland (WRK). And prior to his career at PWN until 2002, Loet worked as a distribution specialist at Kiwa Research and Consulting, where his activities included the coordination of research into asset management of water distribution networks. Loet graduated in 1992 from the Faculty of Civil Engineering, Health Technique and Water Management, at TU Delft.