Leadership built across law, business and international operations.
WASSILA MEDJAHDI MARTINS
FOUNDING PARTNER · ATTORNEY-AT-L AW
WASSILA MEDJAHDI MARTINS
FOUNDING PARTNER · ATTORNEY-AT-L AWAcademic Background Bachelor of Laws (LL.B.) from Université de Lille II, France (2004); Master II in International Business Law from Université d’Aix-Marseille, France (2005); Law degree equivalence from Universidade de São Paulo (USP) (2010); Specialization in Private International Law from the Hague Academy of International Law (2025).
Professional Experience French-Algerian-Brazilian, she arrived in Brazil in 2005 for a Trade Finance internship that defined her career. Over more than twenty years she worked as an attorney at specialized firms and later as General Legal Counsel for a major global trading company, developing deep legal, operational, and financial expertise. In 2017 she co-founded MKS Law, operating between Brazil and Switzerland, currently through WMTLaw Firm.
Practice Areas Banking & Finance; Trade Finance; International Business Law; Agribusiness; Structuring of international transactions.
Languages Portuguese, English, French, and Spanish.
ÚRSULA DOS SANTOS
DOCUMENT MANAGER
ÚRSULA DOS SANTOS
DOCUMENT MANAGERAcademic Background Bachelor’s degree in Human Resources Management from FMU; Course in Information and Document Management from ENAP.
Professional Experience Specialist in managing the lifecycle of physical and digital documents, focusing on regulatory compliance, data privacy, and secure archiving. Her experience in people management combined with best practices in document organization contributes to optimizing internal workflows and enhancing the security of administrative information.
Practice Areas Document Management; Custody of Documents; Compliance; Data Protection; Archival Organization.
Languages Portuguese
MARCELO JUNQUEIRA INGLEZ DE SOUZA
OFCOUNSEL – LEGAL PREVENTION AND LITIGATION
MARCELO JUNQUEIRA INGLEZ DE SOUZA
OFCOUNSEL – LEGAL PREVENTION AND LITIGATIONAcademic Background Ph.D. in Law (Dr. iur.) from Albert-Ludwigs-Universität Freiburg (Germany); Master of Laws (LL.M.) from PUC-SP; Bachelor of Laws (LL.B.) from PUC-SP; International Recognition: Chambers Latin America.
Professional Experience Partner at Xavier Gagliardi Inglez Schaffer Advogados and attorney registered with OAB/SP. He has extensive experience in business litigation, arbitration, and intellectual property, representing major domestic and multinational companies in complex high-stakes disputes. He held leadership positions at Demarest Advogados and serves as a visiting professor and author of legal works.
Practice Areas Corporate Litigation; Arbitration; Intellectual Property; Corporate Disputes; Commercial Law.
Languages Portuguese, English, and German.
DOMINIQUE GRISAY
OF COUNSEL – INTERNATIONAL ARBITRATION
DOMINIQUE GRISAY
OF COUNSEL – INTERNATIONAL ARBITRATIONAcademic Background Master of Laws (LL.M.) from Université Catholique de Louvain; Higher Education Teaching Certificate (Aggregation) from Université Catholique de Louvain; Certificate in International and European Law from Leiden University.
Professional Experience Attorney registered with the Brussels Bar since 1985 and founder of Grisay Lawyers & Consultants since 1997. He has extensive experience in international contracts and investments, European law, competition law, anti-dumping proceedings, and economic sanctions. He serves as an arbitrator in major international institutions, including CEPANI, ICSID, and ICC.
Practice Areas European Law; International Law; International Arbitration; International Investments; Competition Law; European Sanctions.
Languages French, English, and Dutch.
SIBYLLE THENAISY
ATTORNEY - AT- L AW
SIBYLLE THENAISY
ATTORNEY - AT- L AWAcademic Background LL.M. in Transnational Legal Studies from St. John’s University (New York); Master 2 in International Trade and Investment Law from Université Catholique de Lyon; Master 1 in International and European Law from Université Toulouse Capitole; Bachelor’s in Political Science and International Relations from Sciences Po Lyon.
Professional Experience Attorney registered with the Lille Bar and currently practicing in Brussels. She began her career in São Paulo at a firm specializing in international business law, consolidating experience in agribusiness Trade Finance. She advises European investors expanding into Mercosur and Brazilian companies operating toward the European market, combining civil law, common law, and international trade.
Practice Areas Trade Finance; International Trade; International Business Law; International Investments; Mercosur and European Union.
Languages French, English, Spanish, and Portuguese.
CAMILLE LALIER
LEGAL INTERN
CAMILLE LALIER
LEGAL INTERNAcademic Background Master’s degree (M1) in International Business Law from Université Paris 1 Panthéon-Sorbonne (in progress); Bachelor’s degree (Licence) in European and International Law from Université Catholique de Lille (2023–2026); Erasmus Program at Universidade Católica Portuguesa, Lisbon.
Professional Experience Member of the WMTrade team providing support in international operations and legal research related to international trade and agribusiness. Her multicultural background and academic experience across different jurisdictions contribute to handling cross-border demands and developing operations involving European and Latin American clients.
Practice Areas International Business Law; International Trade; Trade Finance; European Law; Legal Research.
Languages French, English, Spanish, and Portuguese.
Guilherme Silva Martins
Associado sênior
Guilherme Silva Martins
Associado sêniorAttorney-at-law, holding a Bachelor’s degree in Law obtained in 2011, an MBA in Economic and Financial Management of Companies from Fundação Getulio Vargas (FGV-SP), as well as a postgraduate qualification from Pontifícia Universidade Católica de São Paulo (PUC-SP). He also completed training in generative and predictive artificial intelligence at the Massachusetts Institute of Technology (MIT).
His practice focuses on business law, compliance, due diligence, credit analysis, risk management, contracts, and corporate transactions, including foreign investment and the remittance of dividends abroad.
He previously served as legal and financial specialist at Monsanto do Brasil, where he worked in the agribusiness sector on credit analysis, assessment of agricultural collateral, barter transactions, CPRs (Cédula de Produto Rural – Rural Product Notes), FIDC structuring (Brazilian investment funds focused on credit rights), economic feasibility studies, contract management, and financial risk analysis.
