At Signature, our deep ties to Latin America – combined with a proven track record in many of the region’s most significant disputes – position us uniquely to advise clients operating or investing in the region.
We have handled disputes across the region and have distinctive strength and depth in matters involving Brazil. Our Lusophone desk is unique in the London market.
We are experienced in advising clients from and involved in the region across the full range of disputes practice areas covering cross-border civil litigation, asset tracing and recovery, international arbitration, investigations, and white-collar crime. Our work spans a broad range of industries, including infrastructure, mining, oil and gas, financial services, technology, telecommunications, commodities, pharmaceuticals, and retail.
Our approach is sector-agnostic and tailored specifically to the needs of our clients. Our trilingual team brings not only fluency in Portuguese, Spanish, and English, but also cultural eloquence and first-hand, on-the-ground experience across the region. We work closely with a trusted network of independent local professionals and leverage strong regional knowledge to navigate the legal, regulatory, and commercial landscapes of Latin America with confidence and agility.
We do not treat Latin America as a uniform market. Instead, we recognise the distinctive legal systems, business environments, and political contexts of each country. This allows us to deliver tailored, strategic solutions that reflect both global standards and local realities—always aligned with our clients’ commercial goals. We are experienced in engaging with local legal institutions, advising clients through regulatory and governmental interactions, and managing cross-border cases efficiently and effectively.
Brazil
The depth of our capabilities and experience in Brazil and Lusophone jurisdictions stands alone in the London market. Members of our team are Brazilian-born, fluent in Portuguese, and/or have spent time living and working in the jurisdiction on major international cases. Our bilingual team is uniquely well-placed to advise clients on their most sensitive matters. Our Lusophone desk can receive instructions from clients and provide advice in Portuguese if preferred. We regularly work with Brazilian colleagues in advising clients on matters with an international dimension but also involving MPF, CADE, CGU and TCU amongst others.
Partner Ioannis Alexopoulos has over 30 years’ litigation and international arbitration experience which includes disputes in Latin America. He has particularly experience in Brazil and he speaks Portuguese. He specialises in financial services, energy/oil & gas, shipping/ international trade, telecoms, IT, and infrastructure projects. Ranked in The Legal 500 UK 2026 Guide’s ‘Hall of Fame’ and in the Chambers UK 2026 Guide for international arbitration, Ioannis is known for being “calm, but fast and decisive in actions” and “a great team leader and a wonderful person”.
Partner Mark Beardsworth has a 25-year track record of successful representations of individuals and corporates in major investigations. He has significant experience in conducting corporate internal investigations for clients that operate across a range of industries. He advises corporates on governance, compliance, management systems and controls, as well as on implementing policies. Mark has been ranked in the leading legal directories for white collar crime for over 15 years. He is a recognised expert for both individuals and corporates and is Band 1 ranked in the Chambers UK 2026 Guide for Financial Crime: Individuals, where he is described as an “excellent lawyer with a proven track record of successfully managing international cases across multiple jurisdictions”.
Partner Duncan Grieve has deep experience in leading cross-border investigations involving issues in foreign jurisdictions, acting for corporates, boards, and individual clients, and has advised on many of the major multinational cases of the last 15 years. He has leading experience in Brazil, Portugal, and Lusophone Africa. Duncan was listed in Global Investigations Review’s “40 under 40” in 2024 and is ranked in The Legal 500 UK 2025 Guide for Regulatory Investigations and Corporate Crime. He is known in the market for having “unparalleled experience in managing simultaneous enforcement actions by multiple international regulators and achieving successful outcomes for his clients,” and he is further described as an “astute tactician”, and “a star”.
Partner Catherine Naylor has nearly 20 years of experience supporting clients to resolve a broad range of commercial disputes, both domestic and cross-border, in particular offshore litigation. Catherine is ranked in The Legal 500 UK 2026 Guide as a ‘Next Generation Partner’ for commercial litigation, where she is commended for her expertise in multi-jurisdictional disputes. Clients describe her as “a highly able partner who can take control of the room and lead a team effortlessly through a case”, and praise her as a “stand out partner”, who is “cool, calm and collected, totally unflappable, and an absolute delight to work with.”
Counsel Pietro Grassi has a decade of experience in matters of public international law, investor-State arbitration, international commercial arbitration, business and human rights, and white-collar crime investigations in Latin America. He is a Brazilian qualified lawyer and a native speaker of Portuguese. Pietro is recognised as a ‘Leading Associate’ for international arbitration in The Legal 500 UK 2025 Guide, where he is described as “standout” and “extremely talented”. Previous Guides have also called him “excellent”, highlighting his “fantastic drafting skills” and “eye to the bigger strategic picture.”