I am an Associate Professor of International and Public Affairs at Columbia University, with faculty affiliations at the Saltzman Institute of War and Peace Studies, the Institute of Global Politics, and the Data Science Institute. I also direct the Emerging Technologies and International Security Initiative at Columbia’s Institute of Global Politics.

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My research examines the political consequences of information and technology, with a focus on democracy and international security. I study how digital platforms, AI-generated media, and online information environments affect public trust, collective action, political violence, and conflict. Across this work, I use computational methods, original data, and social science research designs to study politics in a rapidly changing media environment.

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My articles have been published in the American Political Science Review, International Organization, Journal of Politics, Proceedings of the National Academy of Sciences, and Science Advances, among other outlets.

 

My book, Safe Havens for Hate: The Challenge of Moderating Online Extremism, was published by Princeton University Press in 2025. It explains why militant and hate organizations flourish online despite global efforts to limit harmful content on social media platforms. The book received the 2026 Best Book Award in Information Technology and Politics from the American Political Science Association.

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At Columbia, I teach courses on democracy and democratic erosion in the AI era, data science and public policy, and text as data. I also advise students and early-career researchers across programs and career stages, from undergraduate theses to doctoral dissertations and postdoctoral projects. Working with students is one of the parts of my job I value most. I especially enjoy advising projects that use empirical evidence to ask big questions about political behavior, media and technology, conflict and security, and democratic institutions.