I work mostly on issues at the intersection of ethics, economics, and biology. These include what we should do about antibiotic resistance, and how we should respond to the emerging market for genetic engineering. More generally, I’m interested in the relative role of social norms and legal institutions in solving different kinds of collective action problems. I recently co-edited Philosophy, Politics, and Economics (Oxford University Press, 2015), and moved to San Diego to start a new PPE program. I am also a faculty affiliate of the Institute for Practical Ethics at the University of California at San Diego.