Quinn Emanuel Urquhart & Sullivan, LLP‘s London team acts in both commercial and treaty disputes arbitrations in the mining, energy, telecoms, construction, infrastructure, and oil and gas sectors. Global practice chair Stephen Jagusch KC specialises in investor-state and commercial arbitration; Anthony Sinclair is an energy, mining, and construction-related arbitration expert; while Epaminontas Triantafilou acts for both private corporations and sovereign governments. Dominic Roughton consistently ’demonstrates outstanding dedication’; and both Melis Acuner and Ted Greeno focus on energy disputes. The group further comprises international commercial disputes practitioner Justin Michaelson; shareholder and joint venture conflict specialist Nick Marsh; Alex Gerbi, who acts in cross-border commercial disputes under the LCIA, ICC and SCC rules; and Adam McWilliams, who is particularly noted for his experience in the clean energy sector. Other key figures include Julianne Hughes-Jennett, Gregory Pantlin, Hafsa Zayyan, Marina Boterashvili, and Radu Giosan. In early 2025, Hafsa Zayyan and Manthi Wickramasooriya were both promoted to partner, while James Bremen and Mark Grasso left the firm.
Legal 500 Editorial commentary
Accolades
Client satisfaction
Testimonials
Collated independently by Legal 500 research team.
‘Quinn is able to provide good advice on complex, high-value, bet-the-company disputes.’
‘Highly astute, capable team, always delivering work products on time.’
‘High-quality, great service mentality, and client oriented.’
‘A consistent team with solid experience in complex arbitration disputes.’
‘They possess strong expertise in energy-related matters and an excellent ability to synthesise complex information. They do not hesitate to guide clients away from misguided approaches.’
‘Dominic Roughton is always available and a creative problem solver. Exceptionally proactive and professional, with a strong focus on efficiency and responsiveness. Demonstrates outstanding dedication and work ethic.’
Key clients
- DP World-Djibouti
- Qatar Foundation for Education, Science and Community Development
- Government of Ukraine
Work highlights
Representing DP World in three London Court of Arbitration proceedings against Djibouti, the latter alleging bribery so as to void contracts.
Representing Qatar Foundation against Obrascon Huarte Lain and Contrack (Cyprus) in an ICC arbitration, which concerns the Sidra Hospital in Doha.
Acting for the government of Ukraine in an investment treaty claim, which was commenced by six Chinese nationals under the Ukraine-China BIT, in connection with their purported investments in Motor Sich.
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.
Anthony Sinclair
Leading partners
The strongest partners in their field, leading on market-leading deals and endorsed by peers and clients alike.
Dominic Roughton
Next Generation Partners
Junior partners with significant recognition from clients and peers in the market and key roles on multiple matters.
Manthi Wickrama-sooriya
Hafsa Zayyan
Leading associates
Leading associates with regular involvement in their team's key work, and recognition from peers or clients as being ones to watch.
Radu Giosan
Practice head
Stephen Jagusch KC; Anthony Sinclair; Epaminontas Triantafilou
Other key lawyers
Melis Acuner; Ted Greeno; Dominic Roughton; Justin Michaelson; Nick Marsh; Alex Gerbi; Adam McWilliams; Julianne Hughes-Jennett; Gregory Pantlin; Hafsa Zayyan; Marina Boterashvili; Jagdish Menezes; Radu Giosan; Hafsa Zayyan; Manthi Wickramasooriya