Can a person simultaneously act as counsel and arbitrator? Can an arbitrator have too many appointments? Will artificial intelligence write awards? In this book, we seek to provide an in-depth analysis of key ethics issues that have arisen in the process of reforming investor-state dispute settlement in Working Group III of the United Nations Commission of International Trade Law (UNCITRAL). This comprehensive study of ethical requirements is written by leading experts in the field and discusses key issues, including the UNCITRAL Codes of Conduct, double-hatting, issue conflicts, and many others. The book fills a gap in the literature and offers both practitioners and academics the necessary tools to navigate the complex landscape of ethical considerations in investment dispute settlement.