Nicolaj is a member of the Legal Service of the European Commission. In that capacity, he provides legal advice to the Commission and its services in the areas of trade defence, investment arbitration, and state aid, and represents the former in court cases before the European and national courts and arbitral tribunals. He completed his studies at the Universities of Buckingham (LLB, 2010, summa cum laude), Tsinghua (Cert Putonghua, 2010), Hong Kong (LLM, 2011, cum laude), and Columbia (LLM, 2014, magna cum laude). Before joining the Commission, he worked at two international law firms in Brussels in the areas of WTO law and European economic sanctions and export controls. Nicolaj is a member of the editorial board of the Global Trade and Customs Journal and admitted as attorney-at-law in the state of New York.