Drawing upon the major Harvard works -  Science and the Modern World (1925), Process and Reality (1929) and Adventures of Ideas (1933) -, the essays gathered here on the occasion of the creation of the Applied Process Metaphysics Summer Institute seek, first, to introduce into Whitehead's thought by clarifying what is at stake in his philosophy and by providing a synoptic vision of his key categories in light of their historical development and, second, to foster a creative dialogue among all participants. These essays give the opportunity to travel through most aspects of Whitehead's legacy: anthropology, ecology, education, epistemology, metaphysics, psychology, political theory and relativity physics.