Nicolas de Sadeleer is full professor in UCLouvain, Saint-Louis. He is a specialist of EU law (institutions, internal market), environmental law (international and domestic) and comparative law. He is an active commentator on EU legal and political issues in the areas of trade, investment, and sustainable development. In addition to holding guest academic positions at over  forty universities around the world, he has been  the recipient of six international university chairs.

In addition, he has worked as a lawyer and as consultant with national and international authorities on a wide range of environmental issues. He is supervising several research on the implementation of the EU Green Deal.

His research has been published with leading scholarly publishing houses and journals around the globe.


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Reading professor's de Sadeleer works opens deep insights into the environmental law and its methodology. I warmly recommend his inspiring works and the web site is of huge help, offering very transparent and easy access to profound texts. I praise that very much.

Prof. Dr. Rajko Knez, judge of the Constitutional Court of Slovenia

'Professor Nicolas de Sadeleer’s books are covering many very important and complicated EU environmental law issues – including issues related to other subject-areas. His books offer interesting analysis of legal text as well as analyses of the case law of the ECJ. This website – that Sadeleer has designed – holds pedagogical materials on complicated legal issues, which can be used as part of web-based teaching in environmental law and as the basis for self-studying'.

Prof., Doctor Juris, Ellen Margrethe Basse, Department of Law, Aarhus University, Denmark

‘Professor de Sadeleer is one of the most recognised experts in the field of EU environmental law. I would certainly recommend his books as well as his website!’

Alice Pirlot, Research Fellow in Law at Oxford University