Professor Roger Stenson Clark has played a pivotal role in developing International Criminal Law, and the movement against nuclear weapons. He was one of the intellectual and moral fathers of the International Criminal Court. This Festschrift brings together forty-one appreciative friends to honour his remarkable contribution. The distinguished contributors provide incisive contributions ranging from the reform of the Security Council, to rule of law and international justice in Africa, to New Zealand cultural heritage, to customary international law in US courts, and more. Threaded through these richly diverse contributions is one common feature: a belief in values and morality in human conduct, and a passion for transformative use of law, ‘for the sake of present and future generations.’