• Member Food and Agriculture Organization (FAO)-Panel of Experts on Pesticide Residues in Food and the Environment from JMPR (Joint FAO/WHO Meeting on Pesticide Residues; 2000-2010). A few years as chairman(2009-2010)
  • 2004 to date, member Organisation for Economic Co-operation and Development (OECD) ‘Expert Group on Residue Chemistry OECD Test Guidelines’
  • Chairperson European Food Safety Authority (EFSA) Panel on Plant Protection products and their Residues (PPR-panel; 2012-2015). Panel member since 2006
  • 2012 to date member Scientific Committee of EFSA