Grandjean Avocats is an independent
law firm in Paris dedicated to
dispute resolution
Building on their ten-year track record of working together in a leading international law firm, Jean-Pierre Grandjean, Marguerite Aynès and Thomas Lambard have joined forces to form an independent firm focused on dispute resolution.
The support Grandjean Avocats provides is highly tailored and allows clients to prevent and resolve their disputes in or out of court, and through arbitration and mediation.
Less exposed to conflicts of interest, the partners also develop their roles as Arbitrators and Mediators.
Marguerite Aynès is admitted to the Paris Bar (2008) and the New York Bar (2009).
Along with her two partners, she is co-founding Grandjean Avocats after working for nearly ten years as an associate and then Counsel at Clifford Chance. Her prior experience also includes working for another international law firm for two years.
Marguerite Aynès assists companies and their managers in litigation before civil and commercial courts, as well as in French and international arbitration. In particular, she is involved in complex business law litigation, for French and international companies, and in serial litigation and arbitration.
Her practice areas include civil law and in particular, contract law (breach of contractual obligations) and tort law (product liability), general commercial law (including abusive and/or abrupt terminations of commercial relationships), competition law (unfair competition and misleading advertising), distribution law and sports law.
She represents major players in the aeronautics, pharmaceutical, finance and insurance, telecommunications, mass distribution, automotive and sports sectors.
Marguerite Aynès teaches a course on product liability at the University of Paris I – La Sorbonne and a course on litigation strategy at the Sciences Po Law School.
She holds an LLM (Columbia Law School, 2008), a DEA (Masters) in Private International Law (Université Paris II-Panthéon-Assas, 2005), a Masters in Business Law (Université Paris II-Panthéon-Assas, 2004), and a DU in Comparative Law (Institute of Comparative Law, 2005).
Jean-Pierre Grandjean advises and represents clients in commercial litigation, arbitration and mediation.
He is also an Arbitrator and a Mediator.
Before founding Granjean Avocats, Jean-Pierre Grandjean was a partner at the French law firm Bredin Prat from 1988 to 2002. He then headed the Litigation Practice Group at Clifford Chance in Paris from 2002 to 2019, and co-headed the Arbitration Practice Group.
Jean-Pierre Grandjean appears among the leading litigators in France in both French and international legal directory rankings. He is also highly recognized for his experience in arbitration and mediation.
His practice focuses on commercial and financial litigation, mergers and acquisitions disputes, company or shareholder agreement disputes, (including joint subsidiaries and cooperation agreements), contract and tort liability, distribution law, litigation involving anti-competition practices, product liability and collective actions.
He is a former member of the Paris Bar Council, Secretary of the Conflict of Interest Commission (2016) and the Legal Privilege Commission (2017). He produced two reports that led to establishing certain ethical recommendations for internal investigations conducted by lawyers in France.
He is a director or former director of several professional associations, including the Association Droit & Procédure and the Association Française d’Arbitrage.
He is an expert within the Club des Juristes, a member of the French Committee on Private International Law and the French Arbitration Committee of the ICC.
Jean-Pierre Grandjean has authored publications on contract law, arbitration law and proceedings. He regularly speaks at conferences and seminars.
He is a lecturer at the Sciences Po Law School (post-graduate degree program in Economic Law – Litigation) and at the University of Paris-Saclay (post-graduate degree program in Arbitration and International Trade). He was a member of the Board of the Paris Bar School (EFB) where he was also head of commercial litigation studies. In 2017 and 2018, he sat on the National Commission for the Entrance Exam to the Legal Profession (CRFPA).
Thomas Lambard is admitted to the Paris Bar. He worked in the Litigation and Arbitration Practice Group at Clifford Chance for nearly ten years before founding, along with Jean-Pierre Grandjean and Marguerite Aynès, Grandjean Avocats law firm.
Thomas Lambard advises and represents companies and their managers before civil and commercial courts, as well as in arbitration proceedings.
He focuses on contract and tort liability, restrictive competition practices, company law and construction law, and is involved in several business sectors, including mass distribution, telecommunications, the aeronautics industry, the agri-food industry, the pharmaceutical industry, the hotel industry and the automobile industry.
He holds a post-graduate degree (DEA) in International Business Law from the University of Paris I – La Sorbonne and an LLM from King’s College London.
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