International activities include (unpaid):

• Corresponding member of the INQUA Palaeoclimate Commission (2007-2023);
• NL representative European Pollen database (2008-present);
• NL representative for the INQUA International Council (2008-2023);
• Scientific Advisory Board member Niedersächsisches Institut für historische Küstenforschung, Wilhelmshaven (2018-present);

National activities include (unpaid):

• Chair INQUA-NL Commissie (2008-2023);
• Steering Group member Netherlands Centre for Luminescence dating, NCL (2005-present);
• Advisory Board member Geopark Heuvelrug Foundation (2017-present);
• Board member Royal Dutch Geographical Society, KNAG (2018-present);
• Scientific Advisory Board member Geopark Schelde Delta in oprichting (2020-present);

Editorial activities (unpaid):

• Associate editor Netherlands Journal of Geosciences (2003-2007);
• Editor-in-Chief Netherlands Journal of Geosciences (2008-2013);
• Editorial board member Netherlands Journal of Geosciences (2013-present);
• Editorial board member Elsevier Quaternary Geochronology (2005-present);
• Editorial board member Elsevier Journal of the Geologists Association (2008-present);
• Guest editor Quaternary Science Reviews Special Issue on Early Holocene Climate Oscillations: causes and consequences (Vol. 26: 15-16, August 2007).
• Guest editor Quaternary Science Reviews Special Issue on INTegration of Ice-core, MArine, and TErrestrial records (INTIMATE):  Refining the record of the Last Glacial-Interglacial Transition (Vol. 27: 1-2, January 2008).
• Guest editor Quaternary International Special Issue on Ecosystem responses to palaeoclimate change 60,000-8000 years ago: integrating palaeoenvironmental and archaeological datasets (Vol. 378: August 2015).
• Guest editor Quaternary International Special Issue on Climate change and impacts between 60,000 and 8000 years ago in Central and Eastern Europe (Vol. 288: November 2015).
• Manuscript referee for: Annals of the American Association of Geographers; Basin Research; Boreas; Catena; Earth Surface, Processes and Landforms; Ecological Indicators; Estonian Journal of Earth Sciences; Geoderma; Geomorphology; Holocene; Journal of Geology; Journal of Quaternary Science; Nature Geoscience; Netherlands Journal of Geosciences (Geologie & Mijnbouw); Palaeogeography, Palaeoclimatology, Palaeoecology; PNAS; Quaternaire; Quaternary Geochronology; Quaternary International; Quaternary Research; Quaternary Science Journal (Eiszeitalter und Gegenwart); Quaternary Science Reviews; Radiocarbon; Review of Palaeobotany and Palynology; Vegetation History and Archaeobotany;

Membership of national and international professional organisations:

• KNAG, KNGMG, Quaternary Research Association (QRA), Fluvial Archives Group (FLAG), European Geoscience Union (EGU). 

External (PhD) Examination Committee member:

• Dr Johanna Bos: ‘Aspects of the Lateglacial-Early Holocene Vegetation Development in Western Europe: palynological investigations in Brabant (The Netherlands) and Hessen (Germany)’. Laboratory of Palaeobotany and Palynology, Utrecht University, 16 October 1998.
• Dr Angelica Feurdean: ’Paleoenvironment in northwestern Romania during the last 15,000 years’. Department of Physical Geography, Stockholm University, Sweden, 6 May 2004.
• Dr Jonas Bergman: ‘Tree-limit ecotonal response to Holocene climate change in the Scandes Mountains of west-central Sweden’. Department of Quaternary Geology, Lund University, Sweden, 3 June 2005.
• Dr Signe Ulfeldt Hede: ‘Relative sea-level changes of the Littorina Sea recorded by sedimentological, biological and geochemical parameters in an east Danish lake and an ancient lagoon’. Department of Geography and Geology, Copenhagen University, Denmark, 31 October 2007.
• Dr Morten Fisher Mortensen: ‘Biostratigraphy and chronology of the terrestrial late Weichselian in Denmark - New investigations of the vegetation development based on pollen and plant macrofossils in the Slotseng basin’. Department of Earth Sciences, Aarhus University, Denmark, 30 November 2007.
• Dr Welmoed Soepboer: ‘The modelling of past land cover – a Swiss case study’. Laboratory of Palaeobotany and Palynology, Utrecht University, 10 December 2007.
• Drs Simon van Bellen: Examen de synthèse, Université du Québec à Montréal, Canada, 30 May 2008.
• Dr Frederieke Verbruggen: ‘Stable oxygen isotopes in fossil chironomids’. Laboratory of Palaeobotany and Palynology, Utrecht University, 25 February 2010.
• Dr Cedric van Meerbeeck: ‘Modelling abrupt glacial climate change – On the expression of millennial-scale events in Europe and the North Atlantic Region during Marine Isotope Stage 3’. Faculty of Earth and Life Sciences, Vrije universiteit Amsterdam, 2 July 2010.
• Dr Giovanni Bogota: ‘Pleistocene centennial-scale vegetational, environmental and climatic change in the Colombian Andes: based on biotic and abiotic proxy analyses from Lake Fúquene sediments’. Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, 29 Juni 2011.
• Dr Ingelinn Aarnes: ‘Vegetation and climate change during the deglaciation (15 000 to 7000 cal yr BP) on Andøya, northern Norway’. Department of Biology, University of Bergen, Norway, 17 February 2012.
• Dr Didier Soto: ‘Analyse géographique des changements climatiques des surfaces continentales de l’espace Nord-Atlantique pendant le Tardiglaciaire würmien’. Université Jean Moulin Lyon 3, France, 3 December 2012. 
• Dr Laura Buckles: ‘Unravelling sources and sinks of branched and isoprenoid tetraether membrane lipids in two lakes: implications for their use as geochemical tracer’. Department of Earth Sciences, Utrecht University, 27 May 2015.
• Dr Francesco Muschitiello: 'Deglacial impact of the Scandinavian Ice Sheet on the North Atlantic climate system'. Department of Geological Sciences, Stockholm University, Sweden, 13 May 2016.
• Dr Yurui Zhang: 'Holocene temperature trends in the Northern Hemisphere extratropics'. Faculty of Sciences, Department of Earth Sciences, Vrije Universiteit Amsterdam, 20 November 2017.
• Dr Annelies Storme: 'Holocene environmental evolution of the Middle and Lower scheldt basin in northern Belgium: a multi-proxy study'. Faculty of Sciences, Department of Geology, Ghent University, Belgium, 11 March 2020.
• Dr Renske Hoevers: 'Reconstructing Holocene geoecohydrological floodplain dynamics in NE Belgium'. Faculty of Science, Department of Earth and Environmental Sciences, KU Leuven University, Belgium, 21 June 2023.