Pocar served in the Italian delegation to the UN General Assembly in New York and to the United Nations Commission on Human Rights in Geneva several times.

He also served as Italian delegate in the UNCOPUOS (UN Committee on the Peaceful Uses of Outer Space) and its Legal SubCommittee.

In 2017, Pocar was appointed Judge ad hoc of the International Court of Justice (ICJ) in the case between Ukraine and the Russian Federation.

He taught "Sistema de Derechos Humanos de las Naciones Unidas" at American University Washington College of Law’s Academy on Human Rights and Humanitarian Law as a visiting scholar in the summers of 2012-2015, and "Impunidad y justicia internacional" in the summers of 2016-2017.

He was editor-in-chief of the academic magazine Rivista di diritto internazionale privato e processuale and he co-wrote the Italian yearbook for International law.