Thomas, counsel in the Brussels office and a member of both the International Trade and Public Policy, Regulatory & Government Affairs product groups, focuses on EU regulatory matters, advising companies and trade associations on issues related to chemicals and chemicals in products, including the REACH and CLP Regulations. He is regularly involved in cases before the European Court of Justice and ECHA Board of Appeal. Thomas also has a good understanding of complex decision-making processes within EU institutions and agencies, which he employs to advise on product defense strategies.

Thomas is highly knowledgeable with biodiversity-related legislations, especially in the context of the Nagoya Protocol to the Convention on Biodiversity. He is increasingly involved in matters related to compliance with emerging Environmental, Social and Governance (“ESG”) and sustainability-related diligence obligations.

Thomas holds a PhD in Law from the University of Luxembourg. He wrote his doctoral thesis on Impact Assessment in the EU, “L’Analyse d’impact en droit de l’Union européenne” (Larcier, 2013). In addition, Thomas holds a Master of Laws degree (LL.M) from the London School of Economics and Political Science (UK) and achieved his initial legal education in France, at the universities of Strasbourg and Lyon.

Thomas is fluent in English in addition to his native French, and he has working knowledge of German.

* Dr. Delille’s name has been misused in an email scam involving the recovery of stolen funds; if you have received a suspicious communication from Dr. Delille please check that it is genuine.

Spoken Languages

  • English
  • French
  • German


University of Luxembourg, PhD in Law, Summa Cum Laude

London School of Economics and Political Science, LLM, Merit

Universities of Strasbourg & Luxembourg, LLM, Magna Cum Laude

Université de Strasbourg III, Maîtrise en droit, Cum Laude

University of Lyon, Jean Moulin III, Licence en droit


  • Brussels, Belgium


  • Member of the European Commission ABS Consultation Forum on Horizontal Guidance on the EU Regulation Implementing the Nagoya Protocol.
  • Member of the European Commission Guidance Development Expert Group for the Cosmetics sector to develop Sectoral Guidance on the EU Regulation Implementing the Nagoya Protocol.