Lefteris (Jason) Anastasopoulos

Former Lecturer


Statistics of Causal Inference, Causal Modeling Using Graphs, Experimental Design, Machine Learning Algorithms for Classification and Analysis of Text and Image Data


I was raised as a youngster in Williamsburg, Brooklyn before the hipsters moved in and spent my teenage years in Montclair, New Jersey where I attended Montclair Public High School.

I'm passionate about learning and the arts and in my spare time I enjoy photography, computational photography, reading about great physicists and engineers like Nikola Tesla and crafting things out of various materials.

Current Research

Understanding and Predicting Violent Collective Action Using Scalable Machine Learning Algorithms and a Massive Geocoded Twitter Database (with Jake Williams)

Tilly (2003) observes that “collective violence resembles weather: complicated, changing, and unpredictable in some regards, yet resulting from similar causes variously combined in different times and places.” In this paper, we use textual and spatial features from a massive database of approximately 600 million geocoded messages collected from Twitter’s public streaming API from April 1st, 2014 to April 20th, 2015, to build a series of scalable supervised machine learning classifiers which allow us to predict whether clusters of Tweets are related to peaceful or violent collective action such as protest activity.  We then use this information to discover which linguistic and spatial features distinguish peaceful from violent forms of collective action and how these features speak to the current literature on collective violence.


An Experiment on the Political Effects of Online Comments (with Maya Sen)

There is growing concern among journalists and scholars about the remarkable influence of online commentators. Studies on newspaper or magazine articles on scientific topics have shown that negative comments posted online tend to undermine public knowledge about science and cause increased skepticism of well-established scientific facts (e.g., Anderson et al 2014). In response to a growing sense that anonymous “trolling” has gotten out of hand, online magazines and newspapers such as Salon.com have begun banning anonymous online posts. As more discourse moves online and anonymous online discussion becomes the norm, understanding how anonymous commentary affects political views and interpretations of online content will become even more important. Here, we design an experiment which enables us to measure the that effects of anonymous negative commentary (“trolling”) on political views.


Democracy Fellow, 2013-2015
Ash Center for Democratic Governance and Deliberation
Harvard Kennedy School of Government
Cambridge, MA

PhD, University of California, Berkeley, 2013
Travers Department of Political Science
Fields: Political Methodology, Political Behavior, American Politics
Berkeley, CA

AM, Harvard University, 2005
Department of Statistics
Cambridge, MA

BS, Cornell University, 2003
Industrial and Labor Relations
Ithaca, NY

Last updated:

June 23, 2024