This site is run entirely by me, Jacob Kaplan. I am currently a researcher at the Princeton School of Public and International Affairs. I earned both my PhD degree from the University of Pennsylvania. Now I mostly research policing.

I also have significant experience in the programming language R and have written the introductory R book Crime by the Numbers to teach others. I have written several R packages including ones that create dummy rows and columns, predict race from surnames, handle the FBI's crime data API, and read a common data format for government data - fixed-width ASCII files - into R.

This site makes it easy for people to analyze crime-related data. Select a page in the Data Tool dropdown to look at the type of data you're interested in.