Anne-Nelly Perret-Clermont is Professor at the University of Neuchâtel. Her main areas of interest are the social psychology of cognitive development, the transmission of knowledge, and the transition from youth to adulthood. She has also been awarded the National Latsis Prize by the Swiss National Science Foundation.

Jean-Marc Barrelet is a specialist in history of economy and social history of the nineteenth century. He was Archivist at the Record Office of Neuchâtel between 1988 and 2003. He has also edited many publications of the Canton of Neuchâtel.

A.-N. Perret-Clermont, J.-M. Barrelet, Foreword. Part 1: Growing Up in Neuchâtel. J.-M. Barrelet, Neuchâtel. J.-P. Jermini, Neuchâtel, Jean Piaget's Hometown. M. de Tribolet, Arthur Piaget (1865-1952): Background of Jean Piaget's Father. A.-F. Schaller-Jeanneret, Early Schooling. J.-P. Schaer, Studies at the University of Neuchâtel. M.-J. Liengme Bessire, S. Béguelin, Did Jean Piaget's 'Conversion' From Malacology to Psychology Happen in the Faculty of Arts? F. Vidal, Jean Piaget, 'Friend of Nature'. C. Thomann, Christian and Social Commitment. C. Robert-Grandpierre, Grandchamp and Pierre Bovet. Part 2: A Savant of his Age. T. Zittoun, A.-N. Perret-Clermont, J.-M. Barrelet,The Socio-intellectual Genealogy of Jean Piaget. J. Rijsman, An Intellectual and Technological Panorama of Piaget's World. J. Oelkers, The New Education. J.-J. Ducret, The Intellectual Journey after the Neuchâtel Period. R. van der Veer, The Reception of Piaget's Early Ideas in the Soviet Union. D. Hameline, The Great Images of Jean Piaget. A.-N. Perret-Clermont, Epilogue: Piaget, His Elders and His Peers.