Antonio Ruiz Filho graduated in Law from the Pontifical Catholic University of São Paulo (PUC/SP) in 1984, and has since dedicated himself exclusively and uninterruptedly to criminal law.
He was an intern and lawyer at the criminal law firm Tales Castelo Branco for 14 years (1983/1997), before founding the firm Ruiz Filho Advogados.
Most of the topics covered by Criminal Law, almost always for the defense, but also for the greater complexity.
In professional associations, he was president of the São Paulo Lawyers Association (AASP); director, for two terms, of the São Paulo Lawyers Institute (IASP); state councilor, president of the Commission on Rights and Prerogatives and director of the São Paulo Section of the Brazilian Bar Association (OAB/SP), where he was elected to two constituents. He is currently chairman of the Commission for the Defense of Democracy and Prerogatives of the National Federation of Lawyers (FeNAdv).
He taught Ethics at the Law School of the Universidade Paulista (UNIP) and was an invited to be assistant professor of Criminal Procedure at the Pontifical Catholic University of São Paulo (PUC/SP).
Writes specialized publications.