Jaan Valsiner has made numerous contributions to the development of psychology over the last 40 years. He is internationally recognized as a leader and innovator within both developmental psychology and cultural psychology, and has received numerous prizes for his work: the Alexander von Humboldt prize, the Hans Killian prize, and the Outstanding International Psychologist Award from the American Psychological Association. Having taught at Universities in Europe, Asia and north and south America, he is currently Niels Bohr professor at Aalborg University, Denmark. This book is the first to discuss in detail the different sides of Valsiner's thought, including developmental science, semiotic mediation, cultural transmission, aesthetics, globalization of science, epistemology, methodology and the history of ideas. The book provides an overview, evaluation and extension of Valsiner's key ideas for the construction of a dynamic cultural psychology, written by his former students and colleagues from around the world.