Hans Nelen is Professor of Criminology at the Department of Criminal Law and Criminology at the Faculty of Law of Maastricht University, the Netherlands. He has an academic background in both criminology and law. Between 1986 and the beginning of 2001, Nelen was employed as a senior researcher and research supervisor at the Research and Documentation Centre of the Ministry of Justice in the Netherlands (WODC),  mainly involved in drug, fraud, organized crime, corporate crime and police research. Between 2001 and 2006 he was a senior lecturer/associate professor and senior researcher at the Institute of Criminology of the VU University Amsterdam. Since January 1 2007 Nelen has been working as a professor of criminology at Maastricht University (UM). He is Director of the Maastricht Institute for Criminal Sciences (MICS) and Chair of the Centre for Information and Research on Organized Crime (CIROC). Nelen published a large number of books and articles on a variety of criminological subjects, i.e. corruption and fraud, organized crime, money laundering, legal professionals, the administrative approach to organized crime, cross-border police cooperation and football and crime. Dina Siegel is Professor of Criminology at the Willem Pompe Institute for Criminal Law and Criminology of Utrecht University, the Netherlands. She studied sociology and social anthropology at the Tel-Aviv University, Israel, and obtained her PhD in cultural anthropology at the VU University of Amsterdam, the Netherlands. Siegel worked between 2001-2008 as an assistant professor at the Institute of Criminology of the VU University Amsterdam. From 2009 onwards she has been working as a Professor of Criminology at Utrecht University. She is director of the master programme in Criminology, was the president of International Association for Studies on Organized Crime (IASOC) and is a board member of the Centre for Information and Research on Organized Crime (CIROC).