Partner and co-founder of Belot Bellescize Avocats, Tanneguy de Bellescize practises general and business criminal law, as well as international criminal law.

After working for the French National Assembly and an investigating judge, he joined Visconti Grundler and then Maisonneuve. There he developed a highly specialised expertise in business criminal law.

Tanneguy de Bellescize handles cases involving breaches of probity (corruption, undue influence, embezzlement, illegal interest-taking, etc.), public criminal law (favoritism, misappropriation of public funds, etc.), international criminal law (circumvention of international sanctions, criminal seizures, extraditions, etc.), tax criminal law (tax fraud, money laundering), corporate criminal law (misappropriation of corporate assets, fraud, etc.), labor criminal law (concealed work, etc.). ), press criminal law (defamation, insult, etc.).

In 2024, he co-founded Belot Bellescize Avocats alongside Daphné Belot.

Tanneguy de Bellescize teaches criminal procedure to Master 2 students in the Magistère de droit des activités économiques programme (Master in business law) at the Université Paris 1 Panthéon-Sorbonne.

He is a member of the European Criminal Bar Association, an association of criminal defence lawyers from all over Europe.