Kiesel Le Cosquer Guylène

Guylène Kiesel Le Cosquer

Board Member 

Partner

French Trademark and Design Attorney

European Trademark and Design Attorney

Location
Contact

Tel: +33 1 4016 70 00

With over 40 years of experience in intellectual property, Guylène Kiesel Le Cosquer advises companies, institutions, and legal departments on the strategy, protection, and valorization of IP assets, both in advisory and litigation matters, for major economic players as well as innovative organizations. She began her career as an IP lawyer in the electronics industry and joined Plasseraud IP in 1990, where she led the Legal Department for more than 30 years before joining the Board. She regularly speaks at conferences in France and internationally and is a member of leading international IP organizations (INTA, ECTA, APRAM, AIPPI..). She has also devoted a significant part of her career to training and mentoring future IP professionals and served on the Disciplinary Board of her profession for 15 years. Elected President of the CNCPI three times, the only lawyer to hold this position to date, she contributed to the reform of IP in France (Loi Pacte) and to the establishment of the Unitary Patent and the Unified Patent Court. She currently serves as Advisor to the President of the CNCPI for International Relations. In 2025, she was elected to the UNAPL National Board as ACPI Representative (2025–2028). Her current work focuses on the evolution of professional practices, as well as the intersection of intellectual property with climate change and artificial intelligence. Decorated with the French National Order of Merit in 2019, she is recognized for her commitment to innovation and European technological sovereignty.

Share on:
Practice areas

New technologies and Internet law
Competition and Distribution law
Prosecution , Litigation (infringement, unfair competition)
Negotiation and drafting of agreements

Education

Master in Business Law

DESS de Propriété Industrielle

Languages

English, French

Awards

Chevalier de l'Ordre national du Mérite - 2019

WIPR Leader 2021-2024

WTR 1000 2021-2025 - Prosecution and strategy - Gold band

WTR 1000 2021-2025 - Enforcement and litigation - Bronze band

WTR Global Leader 2021/2023/2025

MIP - IP Star 2021/2022/2023/2024

WIPR Diversity 2022, 2023