Danielle Blaylock is a Post-Doctoral Research Fellow atQueen's University, Belfast, and the University of St. Andrew's.She is the Managing Editor of the Encyclopaedia of GroupProcesses and Intergroup Relations, edited by John Levine andMichael Hogg; and the Encyclopaedia of Identity, edited byRonald Jackson II. Michael Hogg is Professor of Social Psychology atClaremont Graduate University, a Fellow of the Association forPsychological Science, and Foundation Editor of Group Processesand Intergroup Relations. His books include Leadership andPower (2005) with van Knippenberg, The Social Psychology ofInclusion and Exclusion (2005) with Abrams and Marques, theEncyclopaedia of Group Processes and IntergroupRelations (2010) with Levine.