Yrjö EngeströmYrjö Engeström is Professor of Adult Education and Director of the Center for Research on Activity, Development and Learning (CRADLE) at the University of Helsinki. He is also Professor Emeritus of Communication at the University of California, San Dego. Engeström applies and develops cultural-historical activity theory as a framework for the study of transformations and learning processes in work activities and organizations. He is widely known for his theory of expansive learning and for the interventionist methodology of developmental work research. His books include From Teams to Knots: Activity-Theoretical Studies of Collaboration and Learning at Work (Cambridge, 2008) and Learning by Expanding: An Activity-Theoretical Approach to Developmental Research (Cambridge, 2014). Read More Read Less