Danielle Blaylock is a Post-Doctoral Research Fellow at Queen's University, Belfast, and the University of St. Andrew's. She is the Managing Editor of the Encyclopaedia of Group Processes and Intergroup Relations, edited by John Levine and Michael Hogg; and the Encyclopaedia of Identity, edited by Ronald Jackson II. Michael Hogg is Professor of Social Psychology at Claremont Graduate University, a Fellow of the Association for Psychological Science, and Foundation Editor of Group Processes and Intergroup Relations. His books include Leadership and Power (2005) with van Knippenberg, The Social Psychology of Inclusion and Exclusion (2005) with Abrams and Marques, the Encyclopaedia of Group Processes and Intergroup Relations (2010) with Levine.