Three Crowns has been ranked in Band 1 for both Commercial Arbitration and Investor-State Arbitration in the Chambers UK 2027 rankings, maintaining its status as a top tier firm. Constantine Partasides KC is ranked again as a “Star Individual” in this year’s guide, and Gaëtan Verhoosel KC and Reza Mohtashami KC are ranked as Band 1. Gaëtan Verhoosel KC has moved up to Band 2 in Energy & Natural Resources: Disputes, and Leilah Bruton has moved up a band for International Arbitration and Energy & Natural Resources: Disputes.
“ACCLAIMED INTERNATIONAL ARBITRATION OUTFIT WITH AN IMPRESSIVE CLIENT ROSTER”
In their review, Chambers describes Three Crowns as “an acclaimed international arbitration outfit with an impressive client roster” and highlights the firm’s “expertise in both commercial arbitrations and investor-state disputes”, with a client base spanning the energy, natural resources, financial services, telecoms and engineering sectors and work for clients across Latin America, the Middle East and Africa. One market source describes the team as “incredibly talented people” who are “very efficient, very smart, and two steps ahead”. Another notes that Three Crowns provides “high quality, commercial, pragmatic advice” and is “adept at handling complex disputes”. Sources also highlight the firm’s “exceptional responsiveness”, and note that the team has “a good understanding of our business and wider issues, including long-term commercial relationships, politics and geopolitics”.
The firm has also been recognised for its work in Public International Law. Chambers highlights its “strong pedigree in public international law matters”, noting that “the firm fields a bench of highly esteemed practitioners in this area and is well versed in handling arbitrations according to ICSID, UNCITRAL and SCC rules.”
“A HEAVYWEIGHT TEAM OF ARBITRATION SPECIALISTS”
CONSTANTINE PARTASIDES KC
Constantine is one of only two practitioners identified as a “Star Individual” in the arbitration guide, the highest ranking in Chambers. The publication describes him as a “highly esteemed arbitration specialist acting for top-echelon clients in complex commercial and investment treaty disputes”, and recognises his capabilities as an arbitrator. Sources emphasise that Constantine is “one of the greatest advocates of our age” and “a master strategist and technician too”, with another adding that his “ability to distill complex issues into readily digestible, compelling points is second to none”. He is ranked Band 1 for Energy & Natural Resources: Disputes and has also been ranked for his work in public international law, with Chambers noting that he is “well known for acting in high-value disputes under bilateral and multilateral investment treaties around the world”.
GAËTAN VERHOOSEL KC
Gaëtan maintains his Band 1 ranking in this year’s arbitration edition and moved up to Band 2 in Energy & Natural Resources: Disputes, with Chambers highlighting that he “has earned an excellent reputation” for his “extensive commercial and investor-state practice”. One source emphasises that Gaëtan is “excellent and very experienced in international arbitration in the energy sector, including arbitration with governments”, with another adding that he is “very humble and easy to work with”.
REZA MOHTASHAMI KC
Reza is ranked in Band 1 in the International Arbitration guide this year, with Chambers noting that Reza acts in “high-value disputes” with a “particular focus on the Middle East”. Sources describe him as “a brilliant lawyer with deep expertise in the field” who “always provides clear, pragmatic advice and is able to clearly define case strategy”, adding that he “combines sharp analytical skills with eloquence and clarity”.
LEILAH BRUTON
Leilah moves up a band in this year’s guide for international arbitration and Energy & Natural Resources: Disputes, in which Chambers notes that she has “particular expertise in energy, mining and telecoms disputes” and is “experienced acting for clients in a range of jurisdictions and under a variety of different arbitral rules”. Sources highlight that Leilah “is super capable” and “has seen it all”, while another notes that she “demonstrated an encyclopedic view of the case and major details”.