In 1987 I received an MSc in applied physics and in 1992 a PhD in quantum chemistry at the University of Twente, The Netherlands. From 1992 to 1993 I worked at the Royal Netherlands Meteorological Institute (The Netherlands) studying the effects of aircraft emissions on the composition of the atmosphere. From 1993 to 2005 I worked at the National Institute of Public Health and the Environment (The Netherlands) and from 2005 onwards at the Netherlands Environmental Assessment Agency (The Netherlands) as a senior scientist on ozone layer depletion, climate change, and air quality. In 1999/2000 I worked as a visiting scientist at the Aeronomy Laboratory of NOAA (Boulder, CO) studying tropospheric nitrogen dioxide concentrations from satellite instruments. I am involved in both scientific research and in assessments on the national (Dutch Government), European (European Environment Agency) and global scale (IPCC, UNEP, WMO). Topics of expertise include chemistry and transport in the atmosphere, ozone layer depletion from production of CFCs to effects on humans, UV radiation, climate change, global and regional atmospheric modeling, data assimilation and inverse modeling, air quality. Apart from being author and co-author of various scientific publications, I was also a lead author of the WMO/UNEP Scientific Assessment of Ozone Depletion: 1998, coordinating lead author of IPCC Special report of ozone layer depletion and climate change, lead author of the WMO/UNEP Scientific Assessment of Ozone Depletion: 2006. Furthermore, I was an author of several other UNEP, WMO and EEA assessment reports as well as of various national assessment reports.

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Bilthoven, Netherlands