This article first addresses the tension between scientific requirements and policy oriented criminological research. The article then proceeds to describe the historical development of policy oriented criminology in the Netherlands. This narrative can be divided into three phases: early history, the years 1980-1995 and the period from 1995. Criminology in the Netherlands has always had and retains a strong policy orientation. The growth of professional (academic) criminology is a relatively recent phenomenon. ‘Critical’ and ‘public’ criminology always have been and remain the work of individuals. The development of policy oriented criminological research in the Netherlands appears dependent on governmental involvement. The situations in Belgium and the USA give the same impression.

Fifty years ago Tijdschrift voor Criminologie, the Dutch Journal for Criminology, appeared for the first time. It has now developed into a peer reviewed journal with quantitative and qualitative research of high quality. Youth and life course criminology, research into organised and organisational crime, criminographical research, and research into violence are strongly represented nowadays. Changes in the journal reflect more general developments in criminology in the Netherlands and Belgium. In the last 10-15 years the discipline has become more internationally oriented and professional, and scientific backgrounds of criminologists have become more diverse.

This study investigates criminal trajectories of individuals involved in organised crime. It combines qualitative information from the Organized Crime Monitor with rap sheets extracted from the Dutch Judicial Documentation System. A semi-parametric group model is used to cluster 854 individuals into groups with similar developmental trajectories, preceding the organised crime index case. Four judicial trajectories are identified: an early starters group with a high peak in late adolescence (11 percent); a persistent group of offenders with crimes from early adolescence until adulthood (30 percent); a unique group of adult onset offenders (40 percent); and a group of offenders without judicial contacts prior to the index case (19 percent). Largely, suspects who fulfilled different roles in criminal groups (leaders, coordinators, lower-level suspects) are equally distributed over the trajectory groups and the same applies to different types of criminal activities.