William B. Brentani - Partner

Based in the heart of Silicon Valley and the Head of our Palo Alto office, Bill Brentani is a leading capital markets lawyer whose practice focuses on corporate finance and general securities and corporate matters.  Bill regularly works for issuers and underwriters in connection with a broad range of capital market transactions, including initial public offerings (IPOs), follow-on equity and preferred stock (including PIPEs) offerings, and debt, equity-linked, high yield and hybrid capital transactions. Bill was named among the 2024 “Top 100 Lawyers” by Daily Journal and a 2021 Healthcare “MVP” by Law360. He has been recognized as a leading lawyer for a number of years by Chambers USA, which describes him as “highly sought after for his expert counsel on transactions in diverse sectors, including healthcare, technology and retail.” Clients laud him as a “highly technically knowledgeable trusted advisor” and “thoughtful, practical, and great to work with” and, tellingly, that “our needs are his needs.” He currently serves as Head of the Firm’s Palo Alto office and Co-Chair of the Firm’s Opinion Committee and is a former member of the Firm’s Executive Committee. 

Grenfel S. Calheiros - Partner

Head of the Firm’s São Paulo office, Grenfel Calheiros advises clients on capital markets and M&A transactions, with a primary focus on Latin America and especially Brazil. His clients have included a range of leading companies, private equity sponsors and investment banks in IPOs and other securities offerings, cross-border acquisitions, and other complex corporate matters. Recently, he has been involved in the SEC-Registered IPOs of VTEX, Zenvia, Patria Investments, Vasta Platform, MercadoLibre, Linx’s ADS, and the re-IPO of CPFL Energia; Braskem, BRF and Unigel in numerous bond offers; Technology Crossover Ventures’ investment in Nubank; several investments by Softbank in Latin America; Netshoes’ merger with Magazine Luiza; multiple IPOs and follow-on offerings on the São Paulo Stock Exchange; several transactions by Blackstone Real Estate Partners, including the R$1.4 billion acquisition of Alphaville; the $4.8 billion acquisition of Sadia by Perdigão and the related $2.4 billion SEC-registered equity offering by BRF S.A.; and bond offers by BTG Pactual, Embraer, Stoneco, Tupy, Iochpe-Maxion and FS Bioenergia as counsel to the initial purchasers. Grenfel spent the first nine years of his career in Simpson Thacher’s New York office. He is fluent in Portuguese.

Jonathan E. Cantor - Partner

Jonathan’s area of focus is federal income tax with a particular emphasis on complex capital markets transactions, including high yield and investment grade debt offerings, note programs, initial public offerings, liability management transactions (i.e., tender offers, exchange offers and consent solicitations), stock repurchases and asset securitizations. Jonathan also regularly provides tax advice with respect to regulated investment companies in connection with securities offerings, investment activities and fund combinations.

S. Todd Crider - Partner Head of the Firm’s Latin America Practice, Todd Crider advises clients in international corporate finance transactions, mergers and acquisitions and project finance. He divides his time between New York and São Paulo, Brazil. In corporate finance, Todd has led transactions in Latin America and Europe, including advising on equity and debt offerings by issuers from Brazil, Chile, Argentina, Mexico and Colombia, as well as Spain and Portugal. He has handled matters for clients including BAML, BTG Pactual, Citigroup, Credit Suisse, Goldman Sachs, JPMorgan and Morgan Stanley. In M&A, Todd has represented KKR, Apax, Carlyle, Patria, Riverwood and SoftBank, as well as the principals in strategic transactions, including The Boeing Company’s $4.3 billion acquisition of Embraer. In project finance, he has represented sponsors and lenders in hydroelectric projects, airport expansions, toll-road projects and gas-fired generation facilities. A frequent speaker on capital markets, private equity and emerging markets, Todd is also a leader in pro bono activities. He is a member of governing body and executive committee of the Cyrus R. Vance Center of International Justice (where he was founding chair). He also serves as the Vance Center representative to the boards of the Pro Bono Network of the Americas (Red Pro Bono de las Americas) and the Lawyers Council for Civil and Economic Rights of the Americas. Todd is also the Vice-Chair and a member of the Executive Committee of the Rainforest Foundation US and a member of Advisory Board of Howard College of Arts & Sciences of Samford University. 

Paulo Fernando de Menezes Cardoso - Partner

Based in the Firm’s São Paulo office, Partner Paulo Fernando de Menezes Cardoso regularly advises on global securities transactions, including SEC-registered and locally registered initial public offerings, follow-on offerings and investment grade and high yield bonds, as well as on mergers and acquisitions, mainly with a regional focus on Latin America and Brazil. Paulo represents corporate issuers, investment banks and private equity sponsors alike on domestic and international equity and debt offerings as well as mergers and acquisitions across a unique mix of industries including fintech, education, e-commerce, software, infrastructure (including digital infrastructure), communications and telecoms, as well as more traditional sectors such as energy, logistics, oil & gas and minerals. He also advises clients on SEC-reporting matters, mergers and acquisitions, corporate governance and other complex corporate matters, advising clients on the full life-cycle of their businesses.

John C. Ericson - Partner

John represents underwriters and issuers in a wide variety of capital markets offerings. His extensive corporate finance experience includes high yield and investment grade debt offerings, IPOs and secondary offerings, acquisition finance and restructurings. John’s transactional work spans several industries, including the healthcare, consumer/retail, industrials/manufacturing, hospitality, auto and tech sectors. John is ranked by Chambers among U.S. and global capital markets attorneys for debt and equity, and he has been recognized as a “Next Generation Partner” in U.S. high yield by The Legal 500.

Jeffrey H. Knox - Partner

Jeff Knox, former head of the U.S. DOJ Fraud Section, is Co-Managing Partner of Simpson Thacher’s Washington, D.C. office and Global Co-Head of the Firm’s Government and Internal Investigations Practice. He represents multinational corporations and independent board committees in high-stakes investigations by the DOJ, SEC, CFTC, CFPB, and other federal and state enforcement regulators. He has advised some of the world’s leading financial institutions, energy companies, life sciences companies, and technology firms in navigating criminal and civil investigations relating to the FCPA, securities and accounting fraud, market manipulation, False Claims Act, antitrust, international money laundering, economic sanctions, and environmental crimes. Jeff also represents senior executives, in their individual capacity, who are subjects of enforcement investigations. Jeff has served as a government-appointed independent compliance consultant, and represents companies in government and court-mandated monitorships. Prior to joining the Firm, Jeff served as a federal prosecutor for more than a decade, including as the Chief of the DOJ’s Fraud Section in Washington, D.C., and before then, as the Chief of the National Security Section of the U.S. Attorney’s Office for the Eastern District of New York. 

Jeff is recognized as a Band 1 FCPA lawyer by Chambers USA and Chambers Global, and as a “Leading Lawyer” by The Legal 500. Jeff has been named a White Collar MVP by Law360, and is consistently recognized by Chambers USA, Chambers Global, The Legal 500 and Euromoney’s Benchmark Litigation, where sources note him as “one of the best lawyers in the country,” “spectacular, hardworking,” “brilliant with an incredible depth of knowledge,” and “a master strategist with a unique insight into the way the DOJ works,” who “understands cases from multiple different dimensions,” and has “a good combination of substantive expertise and practical knowledge” that “really adds value to the client.” In 2024, Jeff was named a “Distinguished Advisor” in Financier Worldwide’s list of ten “Power Players” worldwide in Investigations & White-Collar Crime. He is a respected voice on corporate compliance and enforcement policy, and serves on advisory boards dedicated to these issues at NYU School of Law and the American Law Institute.     

Borja Marcos - Partner Borja’s practice focuses on mergers and acquisitions, financings and other cross-border transactional corporate matters across Latin America. He regularly advises clients on matters spanning a variety of sectors including energy and renewables, banking, insurance, retail, hospitality and infrastructure of all kinds. Borja has advised on matters involving a wide range of well-known Latin American entities, including Ambipar, Braskem, Despegar, Gerdau, Grupo Rizek, Grupo Romero, Grupo Sura, Mercantil Colpatria, MasPlay, SAAM, Terpel and Volcan, as well as private equity firms such as Advent, Blue Water Worldwide, KKR, Riverwood and Stonepeak.

Borja has been recognized as a “Next Generation Partner” in M&A by The Legal 500 Latin America (2025).

Juan F. Méndez - Partner Fluent in both English and Spanish, Juan Francisco Méndez has a thriving practice advising on transactions involving Latin America and the Caribbean. He has extensive experience in cross-border transactions across the region, including financings, acquisitions, restructurings, investigations and other complex corporate matters. His clients include global investment banks such as JPMorgan, Morgan Stanley, Goldman Sachs, Citigroup and Bank of America, as well as leading Latin American companies such as Pan American Energy, Despegar.com, YPF, FIBRA Prologis, Grupo Mexico, FIBRA Macquarie, Intercorp, Aenza, Minsur, CCU, SAAM, Nutresa, Grupo Sura and Ecopetrol. Juan Francisco has significant experiences working on both U.S. and Latin American transactions and is capable of seamlessly navigating his clients through diverse cultures and business practices. 

Juan M. Naveira - Partner

Juan M. Naveira is a Partner in the Firm’s Corporate Department, focusing on cross-border transactions, primarily involving Latin America. He regularly advises clients on mergers and acquisitions, joint ventures, financings, capital markets transactions, liability management, restructurings and other complex corporate matters. Juan has represented leading companies, private equity sponsors, international investors and investment banks in transactions across a range of industries, including energy and infrastructure, banking and financial services, real estate, agriculture, technology and FinTech, among others.

Juan’s clients on numerous significant transactions have included leading global private equity sponsors and fund managers such as Advent International, The Blackstone Group, Patria Investments and Gramercy Funds Management, leading companies such as Copec S.A., Celulosa Arauco, Banco de Crédito e Inversiones, Colbun and BBVA Mexico, and global investment banks such as J.P. Morgan, Goldman Sachs, Morgan Stanley, Credit Suisse and Bank of America Merrill Lynch.

Juan has been recognized as a “Next Generation Partner” in each of M&A, capital markets and banking by The Legal 500 Latin America (2025).

Juan is also a Hiring Partner of the Firm and Co-Chair of the Firm’s Recruiting Committee.  

William T. Russell, Jr. - Partner

Bill Russell, Head of Simpson Thacher’s Bankruptcy and Restructuring Litigation Practice, represents financial institutions, private equity sponsors, corporations and other businesses in a wide variety of commercial disputes. He focuses on bankruptcy and reorganization matters, banking litigation, securities litigation, and transactional disputes, and has tried cases in state and federal courts as well as in arbitral proceedings. A leader within the legal community, Bill is an active member of several bar and legal services organizations. He is Chair of the New York State Bar Association’s Task Force on Homelessness and the Law, a member of the New York City Bar Association Board of Directors, a member of the Judicial Institute on Professionalism in the Law, and a member of the American Law Institute, and has chaired Legal Services NYC’s Board of Directors and served on the Executive Committee of the New York State Bar Association. He served as a Panel Chair on the Disciplinary Committee for the First Judicial Department and regularly co-authors a column on the New York Court of Appeals for the New York Law Journal.

Kirsten L. Davis - Senior Counsel Kirsten Davis is Senior Counsel in the Firm’s Corporate Department. Kirsten represents issuers and underwriters in both public and private offerings of equity and debt securities and advises both U.S. and non-U.S. clients on general corporate and securities law matters. Kirsten has been recognized among the “Top 100 Women Lawyers” by Latinvex for her capital markets work in the Latin American region (2019 - 2024).

Luiz F. Noronha - Counsel

Luiz F. Noronha is Counsel in the Firm’s Corporate Department based in our São Paulo office where he advises on cross-border transactions, primarily involving Brazil and Latin America, on matters across sectors including technology, e-commerce, telecoms, industrials, healthcare, infrastructure and banking. His practice includes advising clients in mergers and acquisitions, joint ventures, private equity and venture capital investments, as well as equity and debt capital markets offerings and liability management transactions. Luiz regularly represents leading companies, private equity sponsors, venture capital firms, and major investment banking firms throughout Latin America. Latin Lawyer 250 reports that Luiz “has been hailed by clients for his creative thinking and agility.”