Rumiana lectures International Investment Law and EU External Relations and supervises International and Constitutional Law. She practices as a Door Tenant at Thomas More Chambers. Rumiana completed her PhD in Cambridge under the supervision of Prof. James Crawford and assisted him with cases as his Research Associate. Prior to this, she spent time at the Secretariat of the Permanent Court of Arbitration, the European Commission in Brussels and the International Tribunal for the Law of the Sea. Rumiana did her Magister Juris at the University of Sofia, an LL.M Advanced in International Law at Leiden University and was awarded the Hague Academy Diploma in International Law cum laude. She was a founder and editor-in-chief of the Cambridge Journal of International and Comparative Law (now Cambridge International Law Journal). Rumiana is a fellow at the Lauterpacht Centre for International Law, a member of the Centre for European Legal Studies and the Cambridge Centre for Law, Medicine and Life Sciences. She was a Visiting Professor at McGill in 2017.