Fortes, Lopes, Siebner Criminal Law Office

The office

Founded in 2020, Fortes, Lopes, Siebner Advogados is a firm focused on Criminal Law which, through personalized service, with discretion and zeal, seeks to perform a unique and singular work in the performance of its cases, striving for proximity and personality with its clients.

Areas of expertise

The firm provides legal advice to its clients in different spheres of activity, both judicially and out-of-court.

In court, in addition to monitoring its clients' cases on a daily basis, the firm has a strong presence in the country's Superior Courts (Superior Court of Justice and Federal Supreme Court).

In out-of-court, the firm provides legal advice and works in the preliminary stages of investigation.

Moreover, it should be noted that the firm represents the interest of its clients in the most varied areas and spheres of Criminal Law.

Criminal law

The Fortes, Lopes, Siebner Advogados works in all stages of the criminal process, from the preliminary stages of the investigation, such as the drawing up of a police report and the monitoring of a police investigation, to representation in court, before ordinary and higher instances.

In addition, it has extensive experience in criminal enforcement.

Economic Criminal Law

The office has a team of expert lawyers, with experience in advising executives of small and large companies throughout the country on issues related to economic, financial, tax, administrative and bidding crimes, as well as asset fraud, money laundering and consumer relations.

Victim Support

Another extremely important activity performed by the office is the support and provision of legal assistance to victims - representation at police stations to issue an occurrence report, follow-up on a police investigation, filing of a criminal complaint, and representation in court as an accusation assistant.

Partners

Founding partner

Guilherme Fortes Bassi

Partner and founder of the firm, he holds a Law degree from the Pontifical Catholic University of São Paulo (PUC-SP) (2014-2018).

Teaching Assistant to Professor Dr. Gustavo Octaviano Diniz Junqueira in the Criminal Law course at the Pontifical Catholic University of São Paulo/SP (2024–present).

Member of the Institute for the Defense of the Right of Defense (IDDD). Part of the IDDD Advocacy Working Group, dedicated to monitoring the development of laws and other regulatory acts that impact the criminal justice system.

Member of the Brazilian Institute of Criminal Sciences (IBCCRIM).

Has been part of teams at renowned corporate criminal law firms.

Has experience in the public sector, particularly at the Public Defender’s Office of the State of São Paulo, working mainly in the Jury Court and the Police Inquiry Department.

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Founding partner

Lucas Marques Gonçalves Lopes

Partner and founder of the firm, he holds a Law degree from the Pontifical Catholic University of São Paulo (PUC-SP) (2014-2018).

Postgraduate in Human Rights from the Faculty of Law at the University of Coimbra (2020).

Member of the Advanced Studies Group (GEA) in Economic Criminal Law at the Brazilian Institute of Criminal Sciences (IBCCRIM) (2021-2022).

Was a member of the Criminal and Penitentiary Policy Committee of the São Paulo Chapter of the Brazilian Bar Association (OAB) (2023–2024).

Has experience in the public sector, particularly at the Public Defender’s Office of the State of São Paulo, working mainly in the Jury Court and the Police Inquiry Department.

Founding partner

Rubens Siebner Mendes de Almeida

Partner and founder of the firm, he holds a Law degree from the Pontifical Catholic University of São Paulo (PUC-SP) (2014-2018).

Member of the Institute for the Defense of the Right of Defense (IDDD).

Member of the Brazilian Institute of Criminal Sciences (IBCCRIM).

Was a member of the Criminal and Penitentiary Policy Committee of the São Paulo Chapter of the Brazilian Bar Association (OAB) (2023–2024).

Participated as a researcher in the Criminal Studies Center at the Pontifical Catholic University of São Paulo (NECrim/PUC-SP) (2016-2018).

Has been part of panels at renowned corporate criminal law firms.

Articles, Interviews and News

Accused of Killing Husband After Domestic Violence, Refugee Has Preventive Detention Revoked by TJ-SP

April 7, 2025

Legal Consultant ("Conjur") | The Sao Paulo State Court of Justice (TJ-SP) granted habeas corpus to the accused, revoking her preventive detention and replacing it with precautionary measures. The decision considered her profile — a first-time offender, with no criminal record, a regularized refugee, and mother of three minor children — as well as the context of repeated domestic violence, ruling out risks to public order or the criminal proceedings.

Contact

Avenida Marquês de São Vicente, 230, cjs. 601/602, Várzea da Barra Funda, São Paulo/SP, 01139-000

fls.advocacia@outlook.com

(11) 3392-2253