This introductory chapter provides an overview of the ‘what, where, and who’ of Global Political Economy (GPE). GPE is a contemporary field of study which first took shape in the 1960s and 1970s under the label ‘International Political Economy’ (IPE). At its core, GPE is the study of the forms of power—economic, political, material, and social—which shape how the world operates. Despite their names, IPE and GPE have both been criticized for their lack of a ‘global’ viewpoint. This book aims to make a real contribution to the project of GPE as a genuinely ‘global’ field of study. GPE is—and needs to be—a genuinely interdisciplinary field, reflecting the best of the spirit of political economy. The chapter then highlights the value of diversity in the academic field of GPE. It explores how this book is organized and what it offers as a resource.