 After teaching Public International Law at the London School of Economics as a Teaching Assistant to Sir Christopher Greenwood (then Professor at LSE), Feria-Tinta spent a year as a Visiting Research Fellow at the Lauterpacht Centre for International Law, University of Cambridge, at the time under the Directorship of former Whewell Professor of International Law, James Crawford.As a practising lawyer Monica Feria-Tinta has advised States, state-owned entities, non self-governing peoples, governments in exile, international organisations, non-governmental organisations, indigenous peoples, companies, and individuals, in the area of public international law.She started her practising career working for international tribunals; first at the International Criminal Tribunal for the former Yugoslavia and a year later, at the International Court of Justice, gaining experience in the adjudication of complex international litigation both entailing individual international criminal responsibility and State responsibility.