Olivier Prost est avocat associé au bureau de Bruxelles du cabinet Gide depuis 2002, admis au Barreau de Paris (1993) et de Bruxelles (1994). En 2008, il a été nommé Conseiller du commerce extérieur de la France (section Europe).

Olivier est à l'origine du développement de la pratique droit du commerce international et contentieux OMC au sein du Cabinet Gide. Il conseille les entreprises et les gouvernements dans l'utilisation des instruments de défense commerciale (anti-dumping, anti-subvention et sauvegarde). Il est également très actif sur les nouveaux sujets de régulation de la mondialisation : accès au marché, obstacles réglementaires, pratiques discriminatoires, santé et environnement, énergie, secret d'affaires et contrôle des exportations.

Il intervient aussi dans l'élaboration, l'interprétation et la mise en œuvre du droit européen dans les principaux secteurs du droit des affaires, y compris les contentieux communautaires et internationaux.

Olivier Prost est régulièrement référencé comme Leading Individual en International Trade par les guides juridiques Chambers Global and Legal 500. Il figure dès 2018 dans le nouveau classement The Legal 500 Hall of Fame, qui référence les avocats dont l'excellence est régulièrement mentionnée par les clients - le critère pour intégrer ce classement étant d'avoir été classé par Legal 500 comme l'un des meilleurs avocats (Elite leading lawyers) sept ans d'affilée.

« Exceptional competence and professionalism, quick response and total availability in listening and support from Olivier Prost, Anna Dias, and Clement Bouvarel. »
Legal 500 EMEA 2022 - Customs, Trade, WTO & Anti-dumping

« Olivier Prost heads the firm's international trade team and advises European industry associations or manufacturers on trade defence mandates. A client notes: "Olivier Prost is extremely experienced and brings very strong strategic thinking. He is also uniquely able to develop innovative and creative approaches and arguments." »
Legal 500 EMEA 2022 - Customs, Trade, WTO & Anti-dumping

« Olivier Prost heads the firm's international trade team and advises European industry associations or manufacturers on trade defence mandates. A client notes: "Olivier Prost is extremely experienced and brings very strong strategic thinking. He is also uniquely able to develop innovative and creative approaches and arguments." »
Chambers Europe & Global 2022 - International Trade / WTO

« The firm, and especially Olivier Prost and Anna Dias, have shown exceptional knowledge of the sector, unique expertise and overall strong business acumen. The firm stands out in Brussels. »
Legal 500 EMEA 2021

« Olivier Prost and Anna Dias have shown consistent and outstanding legal and market knowledge, business acumen and unique understanding of the assignment specification. They are responsive and extremely reliable, and establish a strong bond and a climate of trust with their clients. »
Legal 500 EMEA 2021

« Olivier Prost and Anna Dias have great professionalism and relational skills; availability, correctness, speed. »
Legal 500 EMEA 2021

« Olivier Prost heads the firm's international trade team and advises European industry associations or manufacturers on trade defence mandates. He is praised for 'always trying to accompany the client in the project, but in a proactive and dialogic way.' Another client highlights his 'valuable inputs on strategy and policy. »
Chambers Europe 2021

« Head of department Olivier Prost is seen by clients as a 'great expert who is to the point' and 'very pleasant to work with.' One source enthuses that he has 'outstanding technical capabilities.' He has a wealth of experience assisting European companies and trade associations with trade remedies and customs matters. »
Chambers Europe 2019

« Gide Loyrette Nouel's Olivier Prost heads a practice with notable strength in trade matters, sanctions issues, anti-dumping investigations and customs work, among other areas. Prost acted for the European Biodiesel Board in an anti-dumping investigation against biodiesel imports from Argentina. Other clients include Arkema, Eurofer and ArcelorMittal. Senior counsel John Lonergan and counsel Anna Claudia Coelho Dias are also noted. Pierre-Jacques Larrieu , who previously served as the head of unit at the European Commission's DG Taxation & Customs Union, is a recent hire. »
Legal 500 EMEA 2019