Gregory obtained his law degree at the Université de Liège and has more than 10 years' experience in sports law.

Gregory handles a wide range of legal matters in the field of sports with European and International Law, with a particular focus on fundamental rights. He assists athletes, investors, sponsors, clubs and both national and international sports governing bodies.

Gregory lectures on “Sport and the internal market” at the Université d'Aix-Marseille. The Liège Bar lists Grégory as an expert in sports law. Furthermore, Gregory is a member of the international lawyers’ association in football law (A.I.A.F.). He is also an arbitrator at the CIDD (Commission Interfédérale Disciplinaire en matière de Dopage) and the Disciplinary Committee of the International Judo Federation (F.I.J.), which is located in Paris.