Gijsbert Cirkel studied Soil Physics and Land Management at Wageningen University. In 2014, he obtained his PhD for research on the spatial and temporal dynamics of hydrology and hydrochemistry in seep-dependent ecosystems. Since 2003, he has worked as a hydrologist on a wide range of hydrological and hydro-chemical topics. His expertise is mainly in researching hydrological and geochemical links between ground and surface water and the vadose zone and translating this to drinking water collection and nature quality. Furthermore, he works as a hydrological/ hydrochemical adviser at OBN research in hydrology, biogeochemistry and experimental measures for the recovery of quaking bogs in stream valleys. He has extensive experience in drawing up and calculating soil physics models such as SWAP and Hydrus 1D/2D and setting up experimental vadose zone research, including research on transporting colloids such as viruses and bacteria through the vadose zone. Finally, he is often employed as an adviser to help with well obstruction problems in drinking water collection and drainage and he is involved in the development of innovative drinking water collection concepts. As a guest lecturer at Utrecht University, he has lectured on groundwater protection and groundwater collection for the Drinking Water and Sanitation master course since 2016.