• Senior adviser to the Dutch Ministry of Infrastructure and Environment
• Senior adviser to the Dutch Ministry of Economics, Agriculture and Innovation
• Senior adviser to the Municipality of Rotterdam and Port of Rotterdam Ltd
• Adviser to the Municipality of The Hague
• Adviser Coast and Delta Instituut DELTARES
• Adviser of the Netherlands Organization for Applied Scientific Research TNO, Institute of Applied Geoscience
• Adviser Netherlands Water Partnership
• Director Foundation Building with Nature®
• Deputy Project Director Sustainable and Multifunctional Use & Development of Regional Waterways and Water Fronts
• Visiting lecturer at 7 Dutch universities
• Visiting lecturer at the International Institute for Infrastructural, Hydraulic and Environmental Engineering, IHE – UNESCO Water Education Institute
• Visiting lecturer at the Institute for Housing and Urban Development Studies, IHS
• Member of the Parliament of the Province of South-Holland (1978 - 2011)
• Member of several Provincial Committees related with Environment, Urban & Rural Planning & Traffic Planning, and Economic Affairs & Energy Supply
