Guilherme Valdetaro Mathias

Mariana is a foundation partner at Zonenschein Advocacia. Before founding her own firm in 2024, Mariana Zonenschein was a partner for more then 10 years in another prominent litigation firm and built a solid career working in the area of strategic litigation, in processes of relevance in relation to matters and values involved. Among the customers it represents are medium and large sized companies operating in various sectors of the economy, such as steel, entertainment, sports, services and ...

Pedro Henrique Carvalho is a top attorney recognized by Best Lawyers in the practice area(s) of Arbitration and Mediation. Pedro Henrique, who practices law in Rio de Janeiro, Brazil, has been recognized since 2025. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Pedro Henrique is held by other top lawyers in the same geographic and legal practice area.

Joanna Bastos is a top attorney recognized by Best Lawyers in the practice area(s) of Tax Law. Joanna, who practices law in Rio de Janeiro, Brazil, has been recognized since 2023. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Joanna is held by other top lawyers in the same geographic and legal practice area.

Graduated from the Pontifical Catholic University of Rio de Janeiro and holds a Master’s degree in International Tax Law from the Brazilian Institute of Tax Law (IBDT) in São Paulo. He has extensive experience in tax legal advisory, with a focus on cross-border transactions, corporate restructuring, financial markets, and capital markets, in addition to significant experience in tax litigation, both administrative and judicial. Over his career, he has taught at Fundaç&atil...

Ana Tereza Basilio is a top attorney recognized by Best Lawyers in the practice area(s) of Litigation. Ana Tereza, who practices law in Rio de Janeiro, Brazil, has been recognized since 2021. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Ana Tereza is held by other top lawyers in the same geographic and legal practice area.

Gustavo André Muller Brigagão Practice Area Tax law with emphasis on administrative litigation and indirect taxation, dealing with matters related to industry, commerce and services sector, focused in on the oil industry, telecommunication market, e-commerce, electric energy, information technology, clothing industry, professional entities, among others. In addition, he has been deeply involved with the tax structuring of major sporting and entertainment events in Brazil (2014 W...

Igor Garbois Fernandes Ribeiro is an associate attorney at Wald, Antunes, Vita e Blattner Advogados with over 13 years of experience in litigation and insolvency. Igor is a lawyer graduated from the Universidade Cândido Mendes (Ucam), a postgraduate degree in Corporate Finance and Capital Markets from the Institute of Postgraduate Studies and Research in Administration at the Federal University of Rio de Janeiro (UFRJ), and a specialty in Judicial Administration from the School of Judic...

Rafael Fiuza Casses is a top attorney recognized by Best Lawyers in the practice area(s) of Litigation and Tax Law. Rafael Fiuza, who practices law in Rio de Janeiro, Brazil, has been recognized since 2024. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Rafael Fiuza is held by other top lawyers in the same geographic and legal practice area.

Adriana Campos Conrado Zamponi is a partner at Wald, Antunes, Vita e Blattner Advogados, has an LLM in Business Law from Ibmec and has completed mediation courses offered by the France-Brazil Chamber of Commerce (CCFB) in cooperation with the Centre de Médiation et d’Arbitrage Paris (CMAP) and the Brazilian Center for Mediation and Arbitration (CBMA). She is also a member of the Brazilian Arbitration Commission (CBAR).

Pedro Marcos Nunes Barbosa (Doctor, Master and Specialist) is its current leader, a Civil, Entrepreneur and IP Law Professor at the Catholic University of Rio de Janeiro, dedicated to litigation and consulting cases (including complex legal opinions), an domain name arbitrator, an expert appointed by trial level courts in IP cases.