Jean-Louis van Gelder currently works as a researcher at the Netherlands Institute for the Study of Crime and Law Enforcement (NSCR). His research interests focus on criminal decision making where he applies insights from social psychology and social cognition to study the interplay of affect and cognition on criminal decisions. Recently, he started researching multiple self models and future self continuity, to apply them to criminal behavior. Other research interests include personality and crime and informality in developing countries. Henk Elffers is a senior-researcher at NSCR and professor of empirical research into criminal law enforcement at VU University Amsterdam. He has worked in the field of rule compliance, spataila criminology, rational choice, guardianship, punishment. Daniel Nagin holds a PhD in Urban and Public Affairs from Carnegie Mellon University, where he is now the Teresa and H. John Heinz III University Professor of Public Policy and Statistics, and a specialist on deterrence theory. He has amply published on various aspects of the rational choice paradigm in criminology. Danielle Reynald trained as a social-psychologist (London) and did a Ph.D in criminology (Amsterdam). She is a lecturer in Criminology at Griffith University, where she teaches spatial and environmental criminology. Her specialism is guardianship research.