His research focuses on issues related to the effectiveness of police tactics in reducing crime and disorder and the impact of police tactics on targeted communities. In particular, his recent research has focused on hot spots and broken windows based policing tactics and their impacts on fear of crime, collective efficacy and police legitimacy. Other recent research has included testing the broken windows theory, studies of the methodologies used to measure disorder and fear of crime and randomized experimental evaluation methodology. Here’s some of his research in those areas: