Etienne holds a doctorate in private law for a thesis addressing the issue of access to fossil fuel energy in international economic law. His dissertation was published in 2018 at the PUAM ("L'accès aux énergies fossiles en droit international économique"). Etienne has published several articles and his practice is focused on the African continent. He worked as a trainee for 1 year at Herbert Smith Freehills in their Paris and Johannesburg offices. Prior to his traineeships, he worked alongside the General-Secretariat at the Common Court of Justice and Arbitration (CCJA) in Abidjan, Ivory Coast and at a law firm in Dakar, Senegal. He is fluent in French and English and is developing a specialization in investment arbitration and the structuration of large energy and infrastructure projects in the African context.