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 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, trade defence investigations, Union customs law, and European economic sanctions and export controls. Nicolaj is a member of the editorial board of the Global Trade and Customs Journal and a teaching assistant at the Institute for International Law at the Katholieke Universiteit Leuven. He is admitted as attorney-at-law in the State of New York.