No other figure has influenced the understanding of our cultural and value systems in the business context as strongly as Clare W. Graves, an American professor of psychology and the founder of the levels of development theory. His relevance to the consulting industry is undisputed, yet only a few authors have engaged with his original works until now. This book is the world's first compilation of Graves' works along with his complete biography and provides a comprehensive explanation of his significance for the science of human development. Rainer Krumm and Benedikt Parstorfer aim with this work to disseminate knowledge about Graves and his extensive oeuvre, as well as to enable readers to gain a solid understanding of the original.