Debevoise & Plimpton LLP fields a ‘thoughtful, measured, and always prepared’ team that leverages the firm’s global capabilities to provide a comprehensive public international law offering. Acting for sovereign states, treaty bodies, and multinational corporations, the team regularly handles ECT treaty claims, ICSID arbitrations, and ICJ advisory proceedings. The ’invaluable’ Lord (Peter) Goldsmith KC and Jeffrey Sullivan KC jointly co-head the practice; Goldsmith has extensive experience before both domestic and international courts and tribunals, while Sullivan focuses his practice on ECT issues and general international arbitration. ‘Fantastic legal strategist’ Conway Blake has a broad practice that covers the Law of the Sea, sovereign and diplomatic immunity issues, and environmental, human rights, and investment treaty matters, while Samantha Rowe is the name to note for international disputes regarding treaty law, state succession, and maritime boundary issues. Monika Hlavkova rounds out the division and assists on investment and commercial arbitrations. Aimee-Jane Lee left the firm in 2025.
Legal 500 Editorial commentary
Accolades
Client satisfaction
Testimonials
Collated independently by Legal 500 research team.
‘Very diligent and professional team. Always reliable and transparent in achieving the best results for the client.’
‘Samantha Rowe in the London office is also a pleasure to work with.’
‘Debevoise & Plimpton sets itself apart as a law firm through its deep commitment to social justice, high-quality legal expertise, and strategic approach to impactful legal work. The firm integrates pro bono service into its core values, ensuring that its lawyers dedicate significant time and resources to advancing human rights and access to justice.’
‘Debevoise & Plimpton's individuals stand out from competitors as they are thoughtful, measured, and always prepared, which creates a sense of confidence and trust in every interaction. Whether navigating complex legal frameworks or working on advocacy efforts, everyone consistently demonstrates clarity, precision, and a deep awareness of the human impact of their work.'
‘The outstanding team at Debevoise, comprised of highly experienced and knowledgeable attorneys, works seamlessly together to provide top-notch legal services and are able to apply their expertise to tackle even the most intricate challenges. The firm consistently demonstrates exceptional legal expertise (especially in the field of public international law and dispute resolution) as well as professionalism, innovative thinking, and a commitment to client service. They have consistently delivered with their valuable advice and strategic guidance, and working with them is always truly a pleasure.’
‘The Debevoise team we work with is very diverse, and seems to foster an inclusive atmosphere that encourages a broad range of perspectives and backgrounds. This is an advantage that was taken into consideration when deciding to work with the firm. They also demonstrate great commercial awareness, staying attuned to industry trends and business dynamics. This enhances their ability to provide relevant, up-to-date legal advice.'
Key clients
- Republic of Azerbaijan
- Suomi Power Networks TopCo B.V.
- Supernova II Bidco BV
- AMF Tjänstepension AB
- Ontario Teachers’ Pension Plan
- The Commonwealth of the Bahamas
- Commission of Small Island States on Climate Change and International Law
- OUTBermuda
Work highlights
Represented Azerbaijan in its claims against the Republic of Armenia for breaches of the Energy Charter Treaty.
Represented SPN, Supernova and AMF, shareholders in Caruna, a Finnish electricity distribution company, in an ICSID arbitration against the Republic of Finland under the Energy Charter Treaty.
Represented Sauna, a subsidiary of Ontario Teachers’ Pension Plan, in an ICSID arbitration against the Republic of Finland under the Energy Charter Treaty.
Lawyers
Hall of Fame
The lawyers at the very top of the profession, widely known and respected by peers and clients for their longstanding involvement in market-leading work.
Leading partners
The strongest partners in their field, leading on market-leading deals and endorsed by peers and clients alike.
Jeffrey Sullivan KC
Next Generation Partners
Junior partners with significant recognition from clients and peers in the market and key roles on multiple matters.
Leading associates
Leading associates with regular involvement in their team's key work, and recognition from peers or clients as being ones to watch.
Practice head
Lord (Peter) Goldsmith KC; Jeffrey Sullivan KC
Other key lawyers
Conway Blake; Samantha Rowe; Monika Hlavkova