Before joining Chatham House, Mathieu was a partner at the risk management and strategic research consultancy AESMA, where he worked as director of Eurasian affairs. 

In his research, Mathieu focuses particularly on Eurasian security and defence issues as well as on Russia’s domestic and foreign policy. 

Having trained as a policy and security analyst in the field of post-Soviet affairs, Mathieu regularly publishes articles and papers on Eurasian security & foreign policy questions. 

He is also a frequent invited speaker at conferences and events around the world. 

He graduated from Sciences Po Toulouse in France and King’s College London (M.A. International Conflict Studies).