Research activities and interests include: 1) Groundwater status assessments  2) Groundwater age and travel time distributions in aquifers, water supply and monitoring wells, groundwater vulnerability and contaminant history, fate and trends 3) Climate change impacts on groundwater quantity and quality -including sea level rise and seawater intrusion, 4) Groundwater contributions to the common European subsurface information platform (EGDI) 5) the relation between groundwater quantity and quality (chemical status) and the ecological status of dependent terrestrial and associated aquatic ecosystems (e.g. impacts by submarine groundwater discharge) 6) The groundwater science - policy interface incl. UN SDGs, the EU Green Deal and the UN Framework Classification for Groundwater (UNFC groundwater)  7) New innovative and sustainable solutions within the water sector.