2019-current Director Netherland Institute of Ecology (NIOO)
2009-current Professor Conservation Biology at the Institute of Environmental Sciences, Leiden University
2012-2019 Dean of the Faculty of Science, Leiden University
2009-2012 Director of the Institute of Environmental Sciences, Leiden University, and head of the Department of Conservation Biology
2003-2012 Professor, special chair Nature Conservation on Farmland, Wageningen University, Department of Nature Conservation and Plant Ecology
2000-2008 Associate professor and head of the Department of Environmental Biology of the Institute of Environmental Sciences, Leiden University
1994-2000 Assistant professor at of the Institute of Environmental Sciences, Leiden University, since 1996 head of the Section Ecosystems and Environmental Quality
1996-1997 Postdoc NWO-STIMULANS-grant
1990-1994 Qualified researcher NWO, PhD project
1986-1990 Researcher at the Institute of Environmental Sciences at Leiden University
1995 PhD Environmental Science, Leiden University, Leiden
1986 MSc Biology (Ecology / Ecotoxicology), Free University, Amsterdam