Most of his whole professional life he has involved computers and computer networks.  Early on he worked in medical physics and medical computing in the departments of neurosurgery and electrocardiology. Later he worked as an analyst and consultant in the Netherlands and in France. Over this period he designed and implemented real-time computer systems and he worked on informatics strategies, project management, development methodologies and information security.

For much of my career though he worked with the European Commission, in what was DG Information Society. He was involved in almost all aspects of the work - policy, research and regulation - and often with an international dimension. He has worked in the area of advanced network applications, particularly from the perspective of security and privacy. He has been heavily involved in Internet matters."