Rom Harre has pushed the boundaries of our thinking about people and societies and has challenged the orthodox philosophy of science and social psychology. His countless books and articles have inspired generations of scholars in philosophy, psychology, linguistics, cognitive science and social theory. The diversity of his work makes that some see him as a leading figure in the critical realist school of philosophy of science, other as a key player in developing a social constructionist approach to psychology. The present volume brings together a careful selection of his key writings and presents them in a framework that stresses the evolution of his thinking as well as the place of his thinking in ongoing debates in different disciplines. The overall theme is the study of people and their ways of life. This is the first book that gives readers a systematic introduction in the conceptual universe of this towering figure.