Cleary Gottlieb Steen & Hamilton

Cleary Gottlieb Steen & Hamilton continues to secure victories in complex commercial and investment treaty arbitrations. The firm boasts a prominent group of lawyers who are proficient in Spanish and Portuguese, allowing them to handle a range of arbitrations. The team is capable of acting as counsel to both investors and states in investment treaty proceedings in matters relating to energy, oil and gas. Ari MacKinnon, co-head of the firm's international arbitration practice, has successfully represented Pluspetrol Peru Corporation and others against a Peruvian buyer of gas in winning an award valued at over $130m in an ICC arbitration. Jeffrey Rosenthal focuses on general commercial arbitrations and has represented both foreign and domestic entities before a range of arbitral bodies. Carmine Boccuzzi has successfully represented the Republic of Argentina in multiple lawsuits across various US jurisdictions, while Katie Gonzalez, who was raised to the partnership in October 2025, has experience counselling both sovereign and private clients. Elisa Zavala is a key associate in the team. All named lawyers are based in New York.