Rupert Brown is Professor of Social Psychology at the University of Kent. He has written widely in the field of group and intergroup processes, his publications including Group Processes (Blackwell, 2000) and Prejudice (Blackwell, 1995).

Sam Gaertner is Professor of Social Psychology at the University of Delaware. He has published numerous articles on intergroup relations and has recently complete the volume Reducing Intergroup Bias (with J. Dovidio, 2000). His study of racism among 'well-intentioned' people won the Gordon Allport intergroup relations prize.