Nevenwerkzaamheden
- Adviseur | National and international funding agencies | European Research Council, Netherlands Organisation for Scientific Research, etc. | Onbezoldigd
- Lid | International Association of Cryospheric Sciences (IACS) | International Council for Science - International Union of Geodesy and Geophysics (ICSU - IUGG) | Onbezoldigd
- Lid | International Commission on Polar Meteorology | International Council for Science - International Association of Meteorology and Atmospheric Sciences (ICSU/IAMAS) | Onbezoldigd
- Lid | Scientific Advisory Board | Sonnenborgh Museum and Observatory | Onbezoldigd