Dr. Coleman has conducted research on social entitivity processes (ingroup/outgroup formation), gender discrimination in organizations, the mediation of inter-ethnic conflict, ripeness in intractable conflict, conflict resolution and difference, and the conditions which foster the constructive use of social power. He recently co-edited a book entitled, The Handbook of Conflict Resolution: Theory and Practice (2000), published by Jossey-Bass, in which he also authored a chapter on intractable conflicts. He has numerous other publications in the area of intergroup conflict, as well.