An enthusiast of underwater diving, she also enjoys discussions on contemporary art and loves black chocolate!

Lawyer at the Paris Bar (1990), Marie-Hélène Tonnellier is Partner since 1999 and created the Digital & Intellectual Property practice.

Marie-Hélène intervenes, both in counselling and litigation, in all issues relating to IT projects, innovations (AI, Robotics, …), e-business and personal data, which are booming with the development of digital technologies. She also intervenes in Media Law and in Intellectual Property Law.

By remaining very active in the distribution, tourism, luxury, new economy, mobility, media or even the services sectors, Marie-Hélène assists her clients in the implementation of strategic projects or in their digital transformation, helps them implement the numerous regulations in these areas and also assists them in disputes that are often complex and innovative. Her dedication to her clients has often made her a strategic counsellor for the legal departments and general management departments that she has been assisting for more than 25 years.

Before joining Latournerie Wolfrom Avocats, Marie-Hélène began her career in London in a solicitors’ firm and then joined, in 1990, the law firm Moquet Borde & Associés (now Paul Hastings) and, in 1995, the law firm Jeantet.




• IT (Artificial Intelligence, robotics, blockchain, connected objects …)
• E-business and the Internet
• Personal data
• Business agreements and partnerships


• Admission at the Paris Bar
• Postgraduate degree (DEA) in Business Law (University Paris I – Panthéon Sorbonne)
• Postgraduate degree (DESS) in Notarial Law (University Paris II – Assas)
• Master’s degree in Business Law (University Paris I – Panthéon Sorbonne)


• French
• English


• Ex-Chairman of the IFCLA
• Member of the supervisory board of the Association Française de Droit de l’Informatique et des Télécommunications (AFDIT)
• Member of the AFPIDA
• Member of the ADIJ


• Senior lecturer for the Master 2 degree in Intellectual Property and Digital Law at the Paris-Saclay University
• Senior lecturer for the Master 2 degree in Intellectual Property and Digital Law at the HEAD Law School

publications & interventions

• Webinar LWA x Inquest « Comment concilier cybersécurité et télétravail ? » (mai 2021)
• Conférence « A-t-on besoin d’un accompagnement juridique pour développer sa start-up dans le monde digital ? », Clinique du droit HEAD (mai 2021)
• Affaire Schrems: probable non-invalidation des clauses contractuelles types, fausse bonne nouvelle? , Edition Multimédi@, n°231 (6 April 2020)
• La législation française permet-elle de protéger entreprises et médias contre les cyberattaques ? Edition Multimédi@, n°185, (12 March 2018)
• SAP peut faire payer les accès indirects (Newsletter 2017)
• Contribution for writing the Lamy form droit du numérique (contrat de maintenance)
• Intervention : The Robot of the Year: lecturer on the legal aspects of artificial intelligence (26 November 2018),
• Intervention : IFCLA Next Tech Revolution: Organisation (in a capacity as chairman) of the biannual conference of the international association regarding all current stakes with respect to new technologies (robotisation, IA, IoT, cloud, blockchain…) – (June 2018)
• Intervention : Digilex ‘Données personnelles et service public: le risque d’un rendez-vous manqué‘ (French Senate, on 30 November 2017)