I am an Assistant Professor at the School of International and Public Affairs and a Faculty Member at the Data Science Institute and the Saltzman Institute of War and Peace Studies at Columbia University. My research uses computational tools to advance the study of conflict, contentious politics, and security policy in the digital era, with a focus on political behavior and extremism on social media platforms.

I am currently working on a book project that examines how extremist groups – who face an increasingly disruptive online information environment – continue to successfully advance their cause, recruit supporters, and inspire violence through social media.

My other work has been published in the American Political Science Review, International Organization, the Journal of Politics, and Political Science Research and Methods, among other outlets.

Here are a couple of podcasts in which I describe some of my work on online extremism:

My research page provides more details, including links to my articles radicalization and violent extremism, the causes and consequences of violent and nonviolent conflict, as well as media and politics more generally.