Research Assistant Mr Robert Real participated in the Frankfurt Investment Law Workshop 2018 on International Investment Law and Constitutional Law. Held on 9 and 10 March 2018, the workshop was organised by the Goethe-University Merton Centre for European Integration and International Economic Order in Frankfurt, Germany. Participants in the workshop explored the different facets of the increasing interaction between international investment law and constitutional law and critically analysed the opportunities and challenges this interaction creates. The panel topics included the (domestic) constitutional law limits of international investment law, the European Union’s constitutional limits of international investment law, the role of constitutional law in investor-state dispute settlement, and international investment law as constitutional law.