Olivier Dauchez is a partner in the Paris "Tax team". His practice focuses on transactional and international tax issues, including mergers and acquisitions, intra-group reorganisations, real estate investments and financial transactions with an international component.

He assists his clients in their dealings with the tax authorities to obtain tax approvals, during audits and before the courts, and in arbitration in tax disputes. His French and international clients include major multinational groups, investment funds, sovereign wealth funds, financial institutions and well-known families. He sometimes works alongside governments as part of the process of devising and drafting new tax legislation or renegotiating international tax treaties.

As a director, he chairs the International Tax Commission of the Institut des Avocats Conseils Fiscaux and is a member of the editorial board of the quarterly journal Fiscalité Internationale. He takes part in the work of the Direct Taxation Committee of the European Tax Confederation.

Graduate of the Magistère de Juriste d'Affaires et Fiscalité and the DESS de droit des affaires et fiscalité from the Université Paris II Panthéon-Assas, he is a member of the Paris Bar, a partner of Gide since 1997 and a member of its Scientific Advisory Board.