Paul Whiteley is Professor of Government at the University of Essex.
Harold D. Clarke is Ashbel Smith Professor in the School of Economic, Political and Policy Sciences at the University of Texas, Dallas and Adjunct Professor in the Department of Government at the University of Essex.
David Sanders is Professor of Government at the University of Essex.
Marianne C. Stewart is Professor in the School of Economic, Political and Policy Sciences at the University of Texas, Dallas.