 While a student, he worked as a journalist, which office kept even after graduating.As a lawyer, he specialized in criminal law and developed intense professional activity, until 1961, in the Jury Court, in criminal courts, in superior courts, and in the Supreme Federal Court, defending, moreover, countless trials of great repercussion, including in politics, before the National Security Court and the Militar Justice.In 1956, he was hired as professor of the Chair of Criminal Law History and Penitenciary Science, in the doctorate degree, in the Faculty of Law of the then Guanabara State, which he taught until 1961.