Marie-Léonie Vergnerie | Fieldfisher
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Professional background

Professional background

I head the Environmental & Renewable Energy department providing advice, litigation and forensic expertise to international companies, particularly in the waste, chemicals, aeronautics, aerospace, automotive, logistics and renewable energy sectors.

I assist at all stages of projects, providing day-to-day support on operational management issues, facilitating relationships with the authorities and assisting with the negotiation and drafting of environmental provisions in M&A and real estate transactions.

I have acquired recognized expertise in waste management and circular economy issues (waste/products, extended producer responsibility schemes, etc.) and in the management of contaminated land (on-site and off-site health risk management, brownfield redevelopment, third party applicants, etc.).

I am a graduate of the Universities of Paris I Panthéon Sorbonne (Master of Private Law, 1997; DEA in Environmental Law, 1998) and the University of London King's College (LLB, 1997). I was admitted to the Paris Bar in 2000. 

Before joining Fieldfisher, I built up a very solid practice over 13 years with the Winston & Strawn Environment team. 

I am bilingual in French and English.

Awards & recognition

Awards & recognition

Legal 500 EMEA 2019
Fieldfisher's Marie-Léonie Vergnerie's team frequently works on cross-practice matters. The two-lawyer practice recently advised on new polluted property financing schemes and on newly entwined waste management and antitrust issues. The team, which notably has strong waste management expertise, was in high demand for strategic advice on the implementation of new circular economy schemes regulation. It is also consulted on environmental liability and advises clients on the sale of contaminated sites and on pollution issues, including dealing with crisis management and litigation. The practice is also sought out to assist in the context of M&A transactions. Leading industrial companies including Honeywell and Safran are among its clients. Associate Vanessa Kurukgy also provides strong support 
Chambers Europe 2019
Marie-Léonie Vergnerie receives praise from market commentators for her leadership of Fieldfisher's environment practice. She stands out for her advice on waste management topics, post-M&A disputes and water contamination litigation. She is praised by clients for her personal involvement in cases and for her availability
Chambers Europe 2018
Marie-Léonie Vergnerie of Fieldfisher is a well-reputed practitioner in the French market, particularly noted by interviewees for her reactivity and "very pleasant" demeanour. She offers expertise in due diligence matters, contamination issues and litigation proceedings
Chambers & Partners 2022
She is reactive and she perfectly knows our company and our needs.
The Legal 500 EMEA 2022
Marie-Léonie Vergnerie and her team are experts in environmental law and demonstrate speed, efficiency and availability.

Authored pieces

All Resources
A metal pipeline marked with "H2" and a gauge is shown running through a green grassy field. Wind turbines are visible in the background under a clear blue sky, indicating renewable energy.
Press Release

Fieldfisher launches report on shaping Europe's hydrogen economy

19.10.2023
This new guide outlines key regulations, supervisory bodies, subsidy schemes and contractual issues concerning green hydrogen production and sale in eight European countries.
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A metal pipeline marked with "H2" and a gauge is shown running through a green grassy field. Wind turbines are visible in the background under a clear blue sky, indicating renewable energy.
Insight

Shaping Europe's hydrogen economy

18.10.2023
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A close-up of an electric vehicle being charged, with the charging cable plugged into the car's port. The background features out-of-focus cars driving on a city street, creating a blurred effect with red taillights.
Insight

The Greenification of Road Transport – Key considerations

11.07.2022
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A fleet of white semi-trucks drives on a multi-lane highway through a rural area. The sky is overcast, and fields stretch out on either side of the road. Street lights line the highway, and distant mountains are visible on the horizon.
Press Release

Greenification of Road Transport

29.06.2022
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Insight

France publishes new law on the Environmental Footprint of Digital Technology

18.11.2021
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What others say…

Chambers Europe 2018
Marie-Léonie Vergnerie of Fieldfisher is a well-reputed practitioner in the French market, particularly noted by interviewees for her reactivity and "very pleasant" demeanour. She offers expertise in due diligence matters, contamination issues and litigation proceedings
Chambers & Partners 2022
She is reactive and she perfectly knows our company and our needs.
The Legal 500 EMEA 2022
Marie-Léonie Vergnerie and her team are experts in environmental law and demonstrate speed, efficiency and availability.