National functions Member of the Royal Netherlands Academy of Arts and Sciences (KNAW) since 2004; member section geosciences, advisory membership of section of biological sciences. Member of Member of Council for Earth and Life Sciences of the KNAW (RAL) (2008-2013) Member of many review panels of the Dutch Science Foundation. Member of the scientific committee of the Netherlands Institute for Ecology (NIOO) (2005-2010). Member of the steering committee of the national Darwin Centre for Biogeosciences (2005-2014). Chairman of the scientific committee of the Dutch Geological Science meeting (NAC-10) (2010). International functions (Co)convenor of international symposia. Member of scientific and programme committees for scientific meetings (IMOG, Goldschmidt, ISME) Referee for research proposals submitted to NSF, NERC, DFG, ERC etc. Member of ERC panel for evalution of research proposals Referee for Science, Nature, PNAS, Nature Geosciences, Geology, EPSL, GCA and many other journals. Member of the EGU Vernadsky Medal, GS Treibs Medal and KNAW Heineken Prize Selection committees. Editorships scientific journals Associate Editor Organic Geochemistry (1994-2004). Editorial Board Geology (2003-2005). Associate Editor Geochimica et Cosmochimica Acta (2006-2014). Editorial board Environmental Microbiology (2008-2018).