During his career, as a district attorney and as a judge, he worked defending civil and political rights, being recognized by colleagues, jurists and governmental institutions.

He started his law career in 1981, working as an administrative employee at the criminal and correctional jurisdiction of instruction, specifically advocating before judicial hearing and with the national attorneys before the National Court for Federal Criminal and Correctional Matters in the City of Buenos Aires. From 1993 to 1995 he was a national prosecutor working on criminal and correctional matters.

He took office as federal judge in the National Court for Federal Criminal and Correctional Matters in 1995. After that, in 2001, he was designated judge in the National Appeal Court for Federal Criminal and Correctional Matters in the City of Buenos Aires, which he led in 2006.

During his professional career, he was a party in important decisions, such as the declaration of unconstitutionality of the laws popularly called “Obediencia Debida” and “Punto Final” within the Poblete case from 2001. This led to new trials charging military members involved in crimes against humanity during the 1976-1983 dictatorship.

Since then, his sentences showed his concern over the defense of the civil rights in cases of state violence during the last dictatorship or during the democratic period. Therefore, he worked with cases involving appropriation and disappearing of minors. He also charged against police officers who repressed protesters during the 2001-2002 crisis.

He also coordinated investigations linked with drug trafficking, economic crime and other international offenses. For instance, he instructed the investigation that caused the prosecution against Pablo Escobar’s widow and son for money laundering and illicit association. Besides, he led numerous complex investigations that ended up in drug confiscation.

As justice, Cavallo prosecuted functionaries from the Executive, Legislative and Judicial Argentinian power. For example, he prosecuted functionaries and business people in the IBM-DGI case, regarding overcharging. He also worked in the case against Ángel Tonietto, former PAMI’S interventor, accused of malicious omission, fraud attempt against the State, etc.

While working as attorney at law, he did not bale on complex and relevant cases. Particularly, he continues working towards liberty of speech, advising trade unions, companies and civil societies.

His professional law and academic career stands out for his dedication to criminal and constitutional law.

Since 1992, he worked in every step of the administrative structure of the National Court for Federal Criminal and Correctional Matters No. 2 in the City of Buenos Aires and in national prosecutions offices no. 2, 6 and 7. Later, from 1998 to 2004, he worked as law clerk in different courthouses of the national criminal and correctional jurisdiction. He took office in 2004 as deputy director of the National Prosecutor General’s Office Human Rights and Criminal Policy Division.

He is partner at JC Abogados y Asociados since 2006.

During his trajectory in court, he was part of many investigations against financial crimes, apart from other complex cases. He was law clerk when the sentence of the Poblete case came out, which led to a change in the legal precedent and the annulment and declaration of unconstitutionality of the laws popularly called “Obediencia Debida” and “Punto Final”.

He was a professor at Universidad de Palermo, teaching criminal law and criminal procedural law. He wrote many articles about these issues and criminal international law.

He received a scholarship from the Washington College of Law to be part of the summer program on International Law from the American University in 2003.