Constantine Partasides KC and Reza Mohtashami KC jointly lead the public international law offering at international dispute specialist firm Three Crowns LLP, which is praised for its ‘great depth of expertise’. Partasides has a strong track record advising on high-value international arbitrations, while Mohtashami takes point on investor-state disputes, particularly in the Middle East. Gaëtan Verhoosel KC handles investment treaty disputes, with particular expertise in the power, oil and gas, and renewables industries, and Manish Aggarwal, who is dual-qualified in India and England, is another notable individual on the investor-state arbitration front, as is Leilah Bruton. The team is ably assisted by Farouk El-Hosseny and Ridhi Kabra.
Legal 500 Editorial commentary
Accolades
Client satisfaction
Testimonials
Collated independently by Legal 500 research team.
‘Manish Aggarwal and Gaetan Verhoosel are exceptional – stand-out players with a real attention to detail and a pleasure to deal with.’
'Great depth of expertise across both PIL and arbitration generally.'
'Gaetan Verhoosel is strong, as is Manish Aggarwal.'
Key clients
- ConocoPhillips
- ContourGlobal
- Elliot Associates
- Eni
- ExxonMobil
- Olayan Financing Company
- PETRONAS
- Republic of Finland
- Sultanate of Oman
- Sacyr
- TotalEnergies
- Trafigura
Work highlights
Obtained, in January 2025, a unanimous rejection from the ICSID Annulment Committee of Venezuela’s attempts to challenge a landmark 2019 US$8 billion award in favour of the client ConocoPhillips.
Representing the Republic of Finland in two separate ICSID arbitrations arising under the Energy Charter Treaty (ECT), worth an aggregate value of approx. EUR3 billion, against the investors in the Caruna Group, a large electricity distribution service operator in Finland.
Representing oil company Eni in a high-stakes ICSID arbitration, with claims totalling US$2.8 billion, against the Federal Government of Nigeria, concerning an oil prospecting licence that has been the subject of criminal proceedings and significant publicity.
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Practice head
Constantine Partasides KC; Reza Mohtashami KC
Other key lawyers
Manish Aggarwal; Gaëtan Verhoosel KC; Leilah Bruton; Farouk El-Hosseny; Ridhi Kabra