One of the most creative innovations of the international diplomatic community in the 20th century was its invention of the international regime," wrote Douglas M. Johnston in his last major work published posthumously (The Historical Foundations of World Order: The Tower and the Arena, Nijhoff, 2008). While regimes often provide order and certainty and a consequent reduction in disputes and misunderstandings, regimes are driven by specific concerns. With diverse disciplinary backgrounds and perspectives, the distinguished contributors to this tribute follow a long tradition of scholarly...