Guillaume is specialized in Energy law and Regulatory law. After a PhD thesis on the essential facilities doctrine, he has focused his practice on the regulation of the energy sector. He advises public and private operators in the following areas:
Guillaume is also a university lecturer in Public law and teaches Energy law at Sciences Po Paris, at the University Paris Dauphine and the University of Amiens.
He is a member of the board of directors of the Association Française de Droit de l’Energie (AFDEN) and of the scientific committee of the European Federation of Energy Law Associations (EFELA).
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