This book is based on a Ph.D. dissertation, written at the Amsterdam Center for International Law at the University of Amsterdam. I would therefore like to thank my two supervisors and co-supervisor. André, you were an awe-inspiring researcher to work with and a good-humored boss to work for. I have always felt that you took my work and opinions seriously. Yvonne, you are the mater familias of the Ph.D. community at ACIL and I greatly appreciate all the guidance you have provided, both in terms of content and process management. The way you combine your warm personality with a professional attitude is a great example to me. Rosanne, your tireless and diligent supervision have been of indescribable value to my work. I want to thank all of my supervisors for always expressing their faith in my ability to complete this process. During the process of writing this book, I have enjoyed several great opportunities to broaden my horizon to other countries, cultures, and schools of thought. I appreciate the opportunity to have taken part in two inspiring summer programs in human rights law at the ?bo Akademi in Turku, Finland and the European University Institute in Florence, Italy. I also greatly enjoyed the Ph.D. program organized by the School of Human Rights Research and am grateful for the wonderful group of young researchers I met there. My appreciation goes out to the Griffith University and the Asia Pacific Center for the Responsibility to Protect for a great research visit to Brisbane, Australia. I am particularly indebted to Alex Bellamy, for sharing his impressive knowledge and enthusiasm.