Co-convenor of ISO/TC 163 – TC 205 Joint Working Group on Energy Performance of Buildings using the holistic approach since 2009.
Convenor of ISO/TC 205 – TC 163 Joint Advisory Group on Coordination of ISO 52000 family since 2018.
As senior scientist at the Netherlands national research organization TNO (1977-2014): initiator and coordinator of various research activities, such as the European CENSE project (2007-2010) to prepare the development of the set of EPB standards (EC Mandate M/480).
Coordinator of various standardization activities on national, European (CEN) and international (ISO) level in the application field of overall Energy Performance of Buildings and building physics.
Member of the coordinating Collective Team Leaders for the development of the set of international (CEN and partly ISO) EPB (EC Mandate M/480, 2011 – 2016).