Daniel J. Singer is an Associate Professor of Philosophy at the University of Pennsylvania, and he co-directs the Computational Social Philosophy Lab with Patrick Grim. His research is about two questions in epistemology and metaethics: how and why epistemic norms apply to us, and how epistemic norms change when we look at groups rather than individuals. He investigates both questions using traditional philosophical methods as well as using agent-based computer simulations. His digital humanities research uses agent-based computer simulations to explore how groups of people act as agents, and in particular, how groups deliberate and come to have views about the world. He also uses agent-based computer simulations to investigate questions related questions in political philosophy, social epistemology, and philosophy of science.