Two Brothers.
One Vision.
For over eight decades combined, Juan and Luis O’Naghten have been instrumental in driving global success, expertly guiding enterprises, CEOs, entrepreneurs, and high-net-worth individuals through the intricacies of complex transactions and international disputes.
Miami, Washington DC, New York, London, Madrid, Paris, Sao Paulo, Buenos Aires, Santiago, Quito, Bogota, Mexico City, Miami, Washington DC, New York, London, Madrid, Paris, Sao Paulo, Buenos Aires, Santiago, Quito, Bogota, Mexico City
synergy
As brothers and partners, they bring a rare synergy— expertise in structuring transactions and cross-border strategy, a mastery in resolving international disputes, and a trusted professional and personal network spanning the Americas, Europe and beyond.
Strategy and Mastery.
Miami, Washington DC, New York, London, Madrid, Paris, Sao Paulo, Buenos Aires, Santiago, Quito, Bogota, Mexico City, Miami, Washington DC, New York, London, Madrid, Paris, Sao Paulo, Buenos Aires, Santiago, Quito, Bogota, Mexico City
Two Brothers.
One Vision.
For over eight decades combined, Juan and Luis O’Naghten have been instrumental in driving global success, expertly guiding enterprises, CEOs, entrepreneurs, and high-net-worth individuals through the intricacies of complex transactions and international disputes.
synergy
Strategy and Mastery.
As brothers and partners, they bring a rare synergy— expertise in structuring transactions and cross-border strategy, a mastery in resolving international disputes, and a trusted professional and personal network spanning the Americas, Europe and beyond.
Tailored.
Whether shaping your next venture or resolving high stakes conflicts, O'Naghten Brothers delivers tailored solutions that endure.
Trust Built on
Legacy and Outcomes.
With a foundation of integrity and a forward-thinking approach, we go beyond legal advice. Our clients gain access to a world-class network, dual perspectives on law and business, and concierge-level service tailored to their needs. From Miami to Madrid, we are your allies in protecting and advancing your interests.
Miami, Washington DC, New York, London, Madrid, Paris, Sao Paulo, Buenos Aires, Santiago, Quito, Bogota, Mexico City, Miami, Washington DC, New York, London, Madrid, Paris, Sao Paulo, Buenos Aires, Santiago, Quito, Bogota, Mexico City
Like falcons spotting opportunities from afar, we build highly skilled teams tailored to your goals, drawing on unrivaled global networks. Whether assembling 20 lawyers across seven countries or a focused team of eight, we strategically unite top talent to expedite success, ensuring every project achieves its objectives with unmatched efficiency.
Global Teams,
Precision Results.
Miami, Washington DC, New York, London, Madrid, Paris, Sao Paulo, Buenos Aires, Santiago, Quito, Bogota, Mexico City, Miami, Washington DC, New York, London, Madrid, Paris, Sao Paulo, Buenos Aires, Santiago, Quito, Bogota, Mexico City
About Juan
Juan T. O’Naghten, excels in structuring complex real estate, financial, and commercial transactions. With extensive experience in financial and commercial transactions across many industries, from real estate and manufacturing, through finance, healthcare and telecommunications, in both domestic and cross-border transactions, he leverages treaty networks to guide businesses across Latin America and Spain, managing multijurisdictional growth with tax-efficient solutions.
About Luis
Luis O’Naghten: Founding Partner, International Arbitration & Commercial Litigation Expert. Acts both as arbitrator in international arbitrations and as party counsel. He is a globally ranked arbitration expert, represents sovereigns and corporations in ICSID, ICC, and UNCITRAL disputes. With 30+ years’ experience, he secures landmark outcomes across Latin America, Europe, and the U.S.
O’Naghten Brothers: Allies that navigate difficult legal waters.
More than advisors, the O’Naghten Brothers are long-term partners—shaping strategy, resolving disputes, and building what’s next.
Whether you’re navigating complex global business issues or seeking the kind of judgment and network that only experience delivers, the O’Naghten Brothers are here for the long game.
Let’s connect.
Strategic Counsel.
Global Reach.
Enduring Solutions.
O'Naghten Brothers crafts financial and business strategies that unlock value—shaping legal frameworks and structuring trans-border deals across Latin America and Europe. Further, whether acting as arbitrator or as party counsel, the brothers resolve complex international disputes with precision, securing landmark outcomes for sovereigns and corporations in arbitrations worldwide.
Together, we harness networks with the most sophisticated lawyers in the world, deep cultural fluency, and expertise in local regulations to serve clients in the United States, in every country in Latin America, Europe, and beyond, backed by decades of experience.