Mr Delbeke becomes the first Belgian director-general at the European Commission in several years.
Jos Delbeke is the vice-director-general at the DG Environment at present. He is considered as an expert in climate issues and the so-called "economics" of environment policies. He is considered as the architect of the European Union Emission Trading Scheme, the largest emissions trading scheme in the world.
Mr Delbeke also plays a major role in the ambitious European climate plan.