Guilherme Valdetaro Mathias
Recognized in Best Lawyers since 2015 About Guilherme Valdetaro Mathias
Guilherme Valdetaro Mathias is a lawyer based in Rio de Janeiro, BR and has been recognized in The Best Lawyers in Brazil™ since 2015. Guilherme Valdetaro Mathias is recognized in the following practice areas:
- Rio de Janeiro, Brazil
- Administrative Law
- Arbitration and Mediation
- Insurance Law
- Litigation
Current Firm: Bermudes Advogados
Location: Rio de Janeiro, BR
Nearby Lawyers
Pedro Grillo is a top attorney recognized by Best Lawyers in the practice area(s) of Tax Law. Pedro, 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 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...
Fernando Novis is a top attorney recognized by Best Lawyers in the practice areas of Arbitration and Litigation. Fernando, who practices law in Brazil, has been recognized since 2020. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Fernando is held by other top lawyers in the same geographic and legal practice areas. Fernando has over 16 years' experience of representing Brazilian and foreign clients in Civil, Corporate, Commercial, Regulator...
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.
Gustavo Leonardos is a top attorney recognized by Best Lawyers in the practice area(s) of Intellectual Property Law. Gustavo, who practices law in Rio de Janeiro, Brazil, has been recognized since 2020. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Gustavo is held by other top lawyers in the same geographic and legal practice area.
Pedro DeRegina is a top attorney recognized by Best Lawyers in the practice area(s) of Intellectual Property Law. Pedro, 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 is held by other top lawyers in the same geographic and legal practice area.
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.
José Gustavo Braga is a top attorney recognized by Best Lawyers in the practice area(s) of Tax Law. José Gustavo, who practices law in Rio de Janeiro, Brazil, has been recognized since 2014. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which José Gustavo is held by other top lawyers in the same geographic and legal practice area.
Luiz Leonardos is a top attorney recognized by Best Lawyers in the practice area(s) of Intellectual Property Law. Luiz, who practices law in Rio de Janeiro, Brazil, has been recognized since 2012. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Luiz is held by other top lawyers in the same geographic and legal practice area.
Explore and Learn
Gun Rights for Convicted Felons? The DOJ Says It's Time.
by Bryan Driscoll
It's more than an administrative reopening of a long-dormant issue; it's a test of how the law reconciles the right to bear arms with protecting the public.
2026 Best Lawyers Awards in Canada: Marking 20 Years of Excellence
by Jamilla Tabbara
Honoring Canada’s most respected lawyers and spotlighting the next generation shaping the future of law.
How to Sue for Defamation: Costs, Process and What to Expect
by Bryan Driscoll
Learn the legal standards, costs and steps involved when you sue for defamation, including the difference between libel and slander.
The Family Law Loophole That Lets Sex Offenders Parent Kids
by Bryan Driscoll
Is the state's surrogacy framework putting children at risk?
Best Lawyers 2026: Discover the Honorees in Brazil, Mexico, Portugal, South Africa and Spain
by Jamilla Tabbara
A growing international network of recognized legal professionals.
Unenforceable HOA Rules: What Homeowners Can Do About Illegal HOA Actions
by Bryan Driscoll
Not every HOA rule is legal. Learn how to recognize and fight unenforceable HOA rules that overstep the law.
Holiday Pay Explained: Federal Rules and Employer Policies
by Bryan Driscoll
Understand how paid holidays work, when employers must follow their policies and when legal guidance may be necessary.
Reddit’s Lawsuit Could Change How Much AI Knows About You
by Justin Smulison
Big AI is battling for its future—your data’s at stake.
US Tariff Uncertainty Throws Canada Into Legal Purgatory
by Bryan Driscoll
The message is clear: There is no returning to pre-2025 normalcy.
