- Senior Scientist Aquatic Ecology at the Netherlands Institute of Ecology (NIOO-KNAW)
- Associate Editor of several international scientific journals
- Member of the Board of the Centre for Wetland Ecology (CWE)
- Board member Stichting Biowetenschap en Maatschappij
- Member several scientific advisory boards: e.g. Wassercluster Lunz Austria; Balaton Limnological Research Institute Hungary