John M. MacDonald


  • According to analysis from John M. MacDonald and co-authors, the move decreased crime by 5 percent in the short term and 18 percent after 20-plus years. To curb gang violence in the 1990s, Los Angeles took an inventive approach, filing civil injunctions against gang “organizations.” Read more in Penn News and Journal of Quantitative Criminology.

  • John MacDonaldEmilio ParradoChenoa Flippen, and Kristen Harknett are among several researchers featured in a new Penn Today article about the city of Philadelphia as a lab, classroom, and collaborator

  • A Next City article mentions study by John MacDonald of the School of Arts and Sciences and others pointing to the value of reviving vacant and abandoned city lots. The researchers concluded that land restoration “can be an effective and scalable infrastructure intervention for gun violence, crime, and fear in urban neighborhoods.” Read more about the article and study here and here.

Penny and Robert A. Fox Faculty Director of the Fels Institute
Professor of Criminology
Professor of Sociology

Ph.D., Criminology, University of Maryland, 1999


  • Penn Arts and Sciences 60-Second Lecture: John M. MacDonald on Using Science to Design Safer and Healthier Cities
  • Penn Law School's Third Visual Legal Advocacy Roundtable: John M. MacDonald on Making Sense of Surveillance and Vérité Footage from the Streets