Gilles Le Chatelier

Partner
Chairman at Adaltys
Chairman
Lyon Office
Member of the Lyon Bar
Experiences
  • Partner at Adaltys Avocats since 2011
  • Director of the Office of the Minister of Justice (2014-2015)
  • Director General of Services, Rhône-Alpes Region (2004-2011)
  • Director of the Office of the Minister for Research (2000-2002)
  • Conseiller d’Etat (on the Council from 1988-1994, from 1997-2000, then from 2002-2004)
  • Expert to the European Commission (1994-1997)
  • Deputy rapporteur to the Constitutional Council (1994)
  • Diploma from the Paris Institute of Political Studies (1984)
  • Former student of the National School of Administration (Ecole Nationale d’Administration) (Michel de Montaigne class 1986-1988)
  • 2025 – Best Lawyers in public law
  • 2025 – Best Lawyers in administrative law
  • 2023 – Best Lawyers in administrative law
  • 2023 – Best Lawyers in public law
  • 2023 – Best Lawyers in Energy Law
  • 2024 – Tier 2, Industry focus: energy – Legal 500
  • 2024 – Tier 1, the regions – Legal 500
  • 2023 – Tier 2, Industry focus: energy – Legal 500
  • 2023 – Incontournable in local authorities and the mixed economy – Décideurs
  • 2023 – A must in administrative contracts and related litigation – Decision-makers
  • 2023 – Unavoidable in public domaniality – Decision-makers
  • 2023 – Excellent in public service – Decision-makers

After a career spanning a little over 20 years within the administration, which led him to hold important responsibilities within the State and local authorities, Gilles Le Chatelier became a lawyer in March 2011 and joined the ADAMAS law firm on this occasion.

Since then, he has used his experience with public decision-makers and his in-depth knowledge of public law in all his areas of expertise.

Working on behalf of public authorities as well as public or private operators working by their side, he is involved in numerous cases in public procurement and public ownership law, as well as in the implementation of complex arrangements.

He also practises in the field of energy law, mainly in the field of hydroelectricity and electricity distribution. He has been a co-author of the commented Dalloz Energy Code since its inception.

He advises many local authorities, assisting them in the design and implementation of their strategic and high-stake projects.

Associate Professor of Public Law (Paris X Nanterre 2003-2005, Lyon II, 2005-2008, Ecole Normale Supérieure, Lyon 2008-2020), he also chairs the Board of Directors of the Lyon Institute of Political Studies (IEP) 2012. He is also a member of the scientific council of the Legal news for local and regional authorities (AJCT- Actualité Juridique des collectivités territoriales) and regularly publishes in numerous legal journals specialised in public law.

Lastly, he is a Knight of the National Order of Merit (2002), as well as of the Order of the Legion of Honour (2016).

Customer comments cited in the LEGAL 500 guide

“Gilles le Chatelier has a great network and experience.” (2022)

Experiences
  • Partner at Adaltys Avocats since 2011
  • Director of the Office of the Minister of Justice (2014-2015)
  • Director General of Services, Rhône-Alpes Region (2004-2011)
  • Director of the Office of the Minister for Research (2000-2002)
  • Conseiller d’Etat (on the Council from 1988-1994, from 1997-2000, then from 2002-2004)
  • Expert to the European Commission (1994-1997)
  • Deputy rapporteur to the Constitutional Council (1994)
  • Diploma from the Paris Institute of Political Studies (1984)
  • Former student of the National School of Administration (Ecole Nationale d’Administration) (Michel de Montaigne class 1986-1988)
  • 2025 – Best Lawyers in public law
  • 2025 – Best Lawyers in administrative law
  • 2023 – Best Lawyers in administrative law
  • 2023 – Best Lawyers in public law
  • 2023 – Best Lawyers in Energy Law
  • 2024 – Tier 2, Industry focus: energy – Legal 500
  • 2024 – Tier 1, the regions – Legal 500
  • 2023 – Tier 2, Industry focus: energy – Legal 500
  • 2023 – Incontournable in local authorities and the mixed economy – Décideurs
  • 2023 – A must in administrative contracts and related litigation – Decision-makers
  • 2023 – Unavoidable in public domaniality – Decision-makers
  • 2023 – Excellent in public service – Decision-makers

Expertises

Public ownership / Fonction publique / Government, public sector and communities /

Business Cases