Stéphane Dionnet McDermott Will & Emery


Stéphane Dionnet is a partner at McDermott Will & Emery, based in Brussels. Prior to that, he worked at Skadden, also in Brussels. Stépahne Dionnet is a qualified lawyer and a member of the Brussels bar, and his practice focuses on European Union and international competition law. He has assisted clients in numerous cartel investigations, in particular with respect to leniency applications before the European Commission and other international competition agencies, as well as corporate investigations relating to cartels. He has worked with clients from a diverse range of industries including consumer products, energy, entertainment, financial services, pharmaceuticals, retail and telecommunications. Earlier in his career, Stéphane Dionnet worked for three years within the “Merger Network” of the European Commission’s Directorate-General for Competition. He was case-handler in high-profile transactions, including phases 1 and 2 with remedies.

2022 Awards

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