That They May Be One is a collection of essays to celebrate Professor Anthony Ijaola Asiwaju, whose entire life, including a long and sustained research career, has been dedicated to the singular cause of policy reconceptualization and conversion of Africa boundaries from inherited postures as barriers and precipitants of conflicts to new roles and functions as bridges and facilitators of peace and cooperation as well as regional integration and sustainable development. The essays, contributed by Nigerians and non-Nigerians drawn from diverse disciplinary backgrounds and operational bases in academics and the practical world of policy making and policy execution, not only illustrate the global spread of a truly multidisciplinary research engagement; they also point to relevance for experts and general readers that are interested in the all-important subject of such an inherently multi-dimensional nature and character.