Katsuhiro Yamazumi is Professor of Education at Kansai University in Osaka, Japan. He was the Director of the Center for Human Activity Theory (CHAT) at Kansai University until 2009. Under his leadership, this Center was awarded the status of an “Academic Frontier” Project for a five-year period between 2005 and 2009 by Japan’s Ministry of Education, Culture, Sports, Science and Technology (MEXT). Professor Yamazumi was the founding editor of “Actio: An International Journal of Human Activity Theory” and has edited a series of books on cultural-historical activity theory. Currently, he is a Research Fellow of the Japan Society for the Promotion of Sciences (JSPS) and an editorial board member of “Learning, Culture and Social Interaction”, an international leading journal on sociocultural research in education.