
Led by the highly experienced Eric Barbier de la Serre, Jones Day stands out for its strong expertise in competition matters in heavily regulated sectors, particularly energy, telecoms and pharmaceuticals, where the team acts for a host of major French and international clients. The wide-ranging practice covers merger control (including global transactions) and antitrust and state aid litigation before the French and European courts and competition authorities. Eileen Lagathu provides strong support, particularly in matters in the pharmaceutical and renewable energy spheres. Brussels-based Charlotte Breuvart also contributes to the practice.
Legal 500 Editorial commentary
Testimonials
Collated independently by Legal 500 research team.
‘Very competent and professional.’
‘The distinctive feature of this team is the ability to combine excellence and empathy.’
‘Eric Barbier de la Serre is an exceptional lawyer. He brings people together and is technically excellent. Eileen Lagathu stands out for her thoroughness and her analytical skills.’
‘Good experience in telecommunications.’
‘Eric Barbier de la Serre is reassuring and solid in his analyses.’
‘Eric Barbier de la Serre is very pragmatic and adapts to the circumstances.’
Key clients
- EDF
- Swile
- Suez
- Sanofi
- Ligue Nationale de Rugby
- Teréga
- IFPEN
- Ubisoft
- Orange
- Crédit Agricole Consumer Finance
Lawyers
Leading partners
The strongest partners in their field, leading on market-leading deals and endorsed by peers and clients alike.

Practice head
Eric Barbier de la Serre
Other key lawyers
Eileen Lagathu; Charlotte Breuvart