Daniel J. Singer is an Associate Professor of Philosophy at the University of Pennsylvania, where he also holds a secondary appointment as an Associate Professor of Legal Studies and Business Ethics in the Wharton School of Business. Singer employs both traditional philosophical methodology and innovative formal research techniques using agent-based computer models. As the author of over two dozen articles and book chapters, most of his work is about understanding what beliefs we should have, including questions in epistemology, the nature of normativity in ethics and epistemology, and social philosophy (focusing specifically on the epistemic impacts of diversity and polarization).