A Python package and companion app for tracking how the foreign-born population has changed across the United States.

A data app for exploring official statistics on US immigration enforcement.

An app for exploring how US demographics have changed since Covid-19.

A Python module for downloading and analyzing multi-year trends from the American Community Survey — contributed to the censusdis package in March 2025.

A suite of R packages for mapping demographic statistics. It has been downloaded over 320k times and is the subject of three online courses.

I received funding from the R Consortium to create a “Working Group” dedicated to US Census data. Together we published “A Guide to Working with Census Data in R”.