Of counsels


Thibault Guillemin is a preferred contact of corporations, institutions and their representatives facing complex issues or reputational risks. He advises as well as litigates on crisis situations entailing simultaneous regulatory, ethical, criminal and social aspects.

Beyond his counseling activities, Thibault is a next generation litigator who defends companies and their managers facing internal investigations and/or enforcements.  He represents for many years several companies and individuals in high-profile cases.

Prior joining the Paris Bar, Thibault practised as a counsel in a French law firm of supreme court attorneys (avocats au Conseil d’Etat et à la Cour de cassation) where he managed many cases involving government bodies.  He has recently advised and defended several institutions and their representatives in matters of public corruption, conflict of interests and favoritism.

Furthermore, he advises legal, compliance and HR departments in setting up, evaluating and strengthening their compliance programs (codes of conduct, internal audit, risk analysis, KYC, professional alerts, training), both with regard to French legislation (Sapin II, Devoir de vigilance) and foreign ones (FCPA, UKBA).

His practise focuses as well on economic sanctions (embargoes, export controls) and export controls that French and European companies may face.

Thibault's team has been recently recognized as "Rising Team 2020" for his Compliance expertise by the Trophées du Droit, a panel of professionals awarding the best lawyers for their practise. His team has been also recognized as "Excellent" for its white collar practise by Leaders League 2020 and ranked by Legal500 as a "Top Tier 3" compliance law firm.

Since 2021, Thibault Guillemin is co-chair of the Comité Stratégique de Filière des Services Juridiques et du Droit, which gathers the legal sector in an industrial-wide approach, to participate in the Plan d'Investissement d'Avenir (PIA).


  • Paris-Dauphine University, University degree, Ethics & Compliance, Anti-corruption Law, 2017
  • Admitted to the Paris Bar, 2002
  • Institut d’Études Politiques de Paris (Sciences Po), Master's degree in Public Affairs, Public Law, Regulatory and Competition Law, 2001
  • Versailles St Quentin University, Master's degree in Public Law, Faculty of Law, 1999

Associations / Outside commitments

  • International Bar Association
  • Le Cercle de la Compliance (ethics & compliance practitioners' association)
  • Association des Avocats Pénalistes (defense attorneys' association)
  • IFA (French Institute of Board Members)
  • Comité Stratégique de Filière des Services Juridiques et du Droit

Recent Publications

  • Compliance in M&A operations, in Dalloz Formation, 2021 (interview)
  • The Executive Officer's liability for Compliance, in Dictionnaire Permanent, Editions législatives, 2021
  • Contractualizing The Risks of Foreign Economic Sanctions: A Cure Worse than The Disease? in Semaine juridique Edition et Affaires n° 28, July 9, 2020
  • Debarment from Public Procurement for Corruption: Theory and Practice, in Semaine juridique Edition et Affaires n°31-35, August 1st, 2019
  • The Adversarial Principle during Internal Investigations, in Décideurs Compliance-Fraudes-Investigations, Paroles d'experts, 2019
  • Criminal Liability for Compliance Officers: the French Perspective, in Revue Internationale de la compliance et de l’éthique des affaires, October 2018
Stéphane FLICHY

Stéphane Flichy assists our French and foreign clients on their commercial, social and criminal issues.

He heads the Litigation Department of the firm, whose team is entirely dedicated to defending companies and their managers, both in their daily disputes (commercial relationship, unfair competition, employment disputes, etc.) and more exceptional procedures, whether judicial (insolvency and winding up proceedings, unions disputes, shareholders' disputes, criminal liability of companies and their representatives) or arbitration.

A recognized expert in French labour law, he manages a number of complex disputes requiring simultaneous mastery of social, criminal and corporate issues.

He is also called upon to manage crisis situations, implement amicable solutions and assess the risks linked to pre-litigation situations in the context of M&A operations.

A graduate of an LL.M from University College of London, he is particularly involved in transnational disputes and defends a number of leading English and American companies.


  • LLM University College of London, 2003
  • Audencia Nantes, Management School, 2002
  • Faculty of Law, Versailles St Quentin University, 2000

Associations / outside commitments

  • Avosial (employment law attorneys' association)
  • Association des Avocats Pénalistes (defense attorneys' association)
  • AmCham (American Chamber of Commerce in France)

As a specialist in both intellectual property law and new information technologies, Alexis Guillemin is an astute expert of all issues of the company’s intangible heritage. Thus, he assists our clients in managing and valuing their immaterial assets both in France and abroad.

Beyond his strong background in copyright as well as in patents, trademarks and designs litigations, Alexis Guillemin assists our clients with the implementation of the big data processes (GDPR), data mining and protection of personal data (French Data Protection Authority -CNIL-, French Data Protection Officer -CIL-, Privacy Shield, cybersecurity).

He also handles the implementation of complex legal schemes related to new information technologies and media law and devotes a substantial part of its activity to the drafting and negotiation of IT contracts.


  • Faculty of Law, Versailles St Quentin University
  • Certificate of specialization issued by the Paris Bar council in intellectual property law
  • Certificate of specialization issued by the Paris Bar council in information technologies and communication law

Associations / Outside commitments

  • Permanent trainer at the French National Institute of Industrial Property (INPI)
  • INTA (International Trademark Association)
  • APRAM (Association of practitioners of trademark and design law)
  • AIPPI (International Association for the Protection of Intellectual Property)
  • IWLA (International Wine Law Association)
  • Droit et Procédure 

Mathilde Delaunay is an expert on non-profit organizations. She advises all types of organizations in this sector (associations, foundations, endowment funds, etc.) on all aspects of their legal and fiscal operations (creation, functioning, restructuring, project management, seminars and training).

She also assists companies, family offices, and institutions with the legal and financial structuring of their general interest projects.


  • University of Toulouse, Master 2 (Master’s degree Year 2), Public law, Territorial Government law
  • Admitted to the Paris Bar, 2009

Mathilde Chevauchez handles issues in connection with all areas of intellectual property law (trademarks, designs, patents, copyright and related rights) and new information technologies (software, data basis, personal data, Research & Development partnerships), for clients comprising start-up companies, listed companies and major French and international groups. She also specializes in distribution law (Terms and Conditions, franchise, commercial licenses).

Her dual expertise in both international private law and as a lawyer-linguist makes her a privileged interlocutor for our foreign clients.


  • Faculty Jean Monnet, University Paris 11, Master 1 (Master’s degree Year 1), International private law, 2010
  • Lawyer-Linguist Diploma of the Higher Education Institute for Translation and Interpreting, 2010
  • Faculty Paul Cézanne, University Aix Marseille 3, Master 2 (Master’s degree Year 2), Research Option, International private law, 2011
  • Faculty Paris Assas, University Paris 2, Master 2 (Master’s degree Year 2), Research Option, Literary Artistic and Industrial Property Law, 2012
  • Admitted to the Paris Bar, 2014

Associations / Outside commitments

  • APRAM (Association of Practitioners of Trademark and Design Law)

Thomas Chanzy’s practice covers both litigation (commercial, financial, securities) and white collar crime, at each stage of the proceedings.

Before joining Guillemin Flichy, Thomas worked in the Compliance/Internal Investigations department of a top-ranked US law firm. He has developed a particular expertise in business ethics and compliance (anti-corruption, human rights, exports controls and economic sanctions).

He assists companies and top managers in the implementation of compliance programs, during internal investigations, as well as he defends them in court.


  • Institut d’Etudes Politiques de Paris (Sciences Po), M.A., Global Business Law and Governance (cum laude), 2015
  • University of Paris II, Panthéon-Assas, Master 2 (Master’s degree year 2), Commercial Litigation, Arbitration and Dispute Resolution (major), 2016
  • Admitted to the Paris Bar, 2017

Recent Publications

  • Debarment from Public Procurement for Corruption: Theory and Practice, in Semaine juridique Edition et Affaires n°31-35, August 1st, 2019
  • Contractualizing The Risks of Foreign Economic Sanctions: A Cure Worse than The Disease? in Semaine juridique Edition et Affaires n° 28, July 9, 2020
  • The Executive Officer's liability for Compliance, in Dictionnaire Permanent, Editions législatives, 2021
Agathe LUX

Agathe Lux specializes in providing legal and tax advice to non-profit organizations (associations, foundations, endowment funds, etc.). 

Lawyer since 2017, she has been devoting herself entirely to project leaders in the social economy field. 

Prior to joining Guillemin Flichy, Agathe worked for more than 3 years in the “Non-Profit Organizations” department of an international law firm. 

Thanks to her public law training, supplemented by a solid background in business law, Agathe adopts a cross-disciplinary approach to cases.


  • Master’s Degree I, Public Business Law, University Paris II - Panthéon-Assas, 2014
  • University Diploma “Cornerstone of Public Law”, University Paris II - Panthéon-Assas, 2014
  • Master’s Degree II, Professional Section, Business Law, “International Business Lawyer” specialty - University Paris V - Descartes, 2015
  • EFB Paris - CAPA, 2016
Juliette GARCIA

Juliette Garcia specializes in labor and social security law and offers counsel as well as assistance in litigation. She advises and defends French and foreign compagnies on individual and collective labor relations (employment issues (employment contracts, dismissals, restructuring, professional elections, employee savings schemes, working hours, management packages, social audits, etc.).

She also handles issues relating to the dismissal of corporate officers involving labor law, corporate law and, where applicable, criminal law issues.


  • Master 1, Economic Law, Sciences Po Paris, 2016
  • Master 2, Business, Market, Regulation,  Sciences Po Paris, 2018
  • Admitted to the Paris Bar, 2020
Support Staff
Patricia HUVELIN

After a 10-years experience in the advertising industry where she developed key accounts customers, Patricia Huvelin provides the administrative and financial management of the firm (HR, general services, accounting and management control), as well as its communication (press, social networks, events, trainings), responsibilities for which she can rely on a dedicated team.

Her versatility and great listening, combined with real adaptation skills make her a privileged interlocutor to our suppliers and partners.


  • EFAP – Ecole des nouveaux métiers de la communication (Communication’s new jobs School)
  • HEAD (Hautes Etudes Appliquées du Droit), Master Office Manager / Secrétaire Général, 2019

Associations / Outside commitments

  • COM’SG – Cercle des Office managers et Secrétaires Généraux de Cabinets d’Avocats (association of law firms’ office managers and secretaries general)

Wendy Veerasamy is in charge of the physical and telephone reception of the firm.

She takes part in the administrative management of the general services.


  • Professional Qualification certificate