Conducting the research that resulted in this book would not have been possible without the assistance of many individuals and institutions. I am particularly grateful to all who participated in my research, either by taking the time to be interviewed or by allowing me to observe them at work. I sincerely appreciate your openness and your trust. Thanks to my supervisors Cedric Ryngaert and Kim Loyens. You have always provided both thorough and timely feedback to my work, and have continuously supported me in developing my own ideas. Together, you have provided an inspirational example of interdisciplinary coope ration, being genuinely interested in each other's expertise and appreciating differences in values between research traditions. I also thank the members of the reading committee: Kevin Davis, Judith van Erp, François Kristen, Abiola Makinwa and Karin van Wingerde. Thank you for your valuable comments and questions. And to my paranimfs, Jeff Handmaker and Judith Kaspersma: thank you for your support throughout the project, and especially during this final year. There were many people at Utrecht University who provided a supportive environment. I thank my colleagues in the research group on Unilateralism and the Protection of Global Interests (UNIJURIS), as well as my colleagues at the Utrecht Centre for Accountability and Liability Law (UCALL). I have also felt connected with several colleagues at the Netherlands Institute of Human Rights (SIM), the Willem Pompe Institute for Criminal Law and Criminology, and the research area of Institutions for Open Societies (IOS).