Sandra Schruijer is Professor of Organization Sciences at the Utrecht University School of Governance and Professor of Organizational Psychology at Tias School for Business and Society, Tilburg University, both in The Netherlands. She holds a Master degree in Social and Organizational Psychology, and in History. She gained her PhD in the Social Sciences in 1990. Her current research involves the psychological dynamics of conflict and collaboration within groups and between organizations. She also has an interest in the history of social psychology. Sandra is former Editor-in-Chief of the Journal of Community and Applied Social Psychology. Sandra further heads Professional Development International, an institute that organizes professional development programmes and consults organizations and managers with respect to interorganizational collaboration and large-scale change.