Niels Blokker is Professor of International Institutional Law at Leiden University (Schermers Chair) and was previously Deputy Legal Adviser at the Ministry of Foreign Affairs of the Netherlands. Together with the late Henry Schermers, he has published International Institutional Law (Brill/Nijhoff, 6th ed. 2018). Together with Nico Schrijver, he has edited The Security Council and the Use of Force (Brill/Nijhoff, 2005), Immunities of International Organizations (Brill/Nijhoff, 2015) and Elected Members of the Security Council (Brill/Nijhoff, 2020). He is co-founder and co-editor in chief of the journal International Organizations Law Review (Brill/Nijhoff).