I am an anthropologist based in the Department of Human Evolutionary Biology and Program for Evolutionary Dynamics at Harvard University. I study modern human behavior focusing on collective action, violence, norms, and institutions. My principal fieldwork occurs in southwest Ethiopia where I have conducted fieldwork since 2009. My research has been funded by the National Science Foundation, the Wenner-Gren Foundation, the Harvard Initiative for Mind, Brain and Behavior, and the Harvard Foundations of Human Behavior program.