Guilherme Valdetaro Mathias, Global

Ranked in 2 Practice Areas

Band 4

Insurance

Brazil

2 Years Ranked

Band 5

Dispute Resolution: Litigation

Brazil

13 Years Ranked

Ranked in Guides

Brazil 2025

About

Provided by Guilherme Valdetaro Mathias

Global

Practice Areas

Dispute Resolution: Civil law, contracts, regulatory law, tort, civil litigation, and arbitration.

Career

Litigation partner specialized in complex disputes involving real estate, insurance, corporate, commercial, and finance contracts, Guilherme is recognized as a leading litigator and recommended as an “efficient and hard-working lawyer” by Chambers.

Professional Memberships

Brazilian Bar Association (OAB/RJ, OAB/SP, OAB/DF).

Publications

Author of articles and chapter of books on dispute resolution matters published by Revista de Arbitragem e Mediação, Revista dos Tribunais, Revista do Direito da Energia, among others.

Personal

Partner at Sergio Bermudes Advogados since 1994.

Professor of Civil Law at PUC-Rio, FGV-Rio, Magistracy School of the Rio de Janeiro State Court of Justice (EMERJ), Fundação Escola Nacional de Seguros (FUNENSEG), State University of Rio de Janeiro (UERJ), and at the MBA Program in Business Law and MBA Program in Insurance Law at Fundação Getúlio Vargas (FGV-Rio).

LL.M in Civil Law from UERJ.

LL.B from Fluminense Federal University (UFF).

Chambers Review

Provided by Chambers

Chambers Global Guide

Insurance - Brazil

Band 4

Individual Editorial

Guilherme Valdetaro Mathias is a noteworthy lawyer with a history of working in strategic litigation matters before the superior courts. His knowledge and client service have been commended by the companies that work with him, especially those from the health insurance field.

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Dispute Resolution: Litigation - Brazil

Band 5

Individual Editorial

Partner Guilherme Valdetaro Mathias dedicates his practice to litigation mandates, representing clients in corporate disputes, annulment of litigation settlement and contractual disputes.

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Strengths

Provided by Chambers

Guilherme has a vast knowledge of the insurance market and extensive presence in the courts. He draws on past cases to enrich the discussions.