Rainer Forst (Goethe-Universität Frankfurt), winner of the 2012 Gottfried Wilhelm Leibniz Prize, works mainly on political theory, pragmatism, tolerance, and political and social justice. He is considered one of the world's most eminent authorities on the subject of toleration. This year's Simon Lectures occur under the general title "The Nature of Normative Concepts: Dependence vs. Independence."
Valerie Tiberius, a professor of Philosophy at the University of Minnesota, focuses her research and teaching on ethics and moral psychology, with a special interest in applying Humean principles to modern philosophical questions. Much of her work is centered at the junction of practical philosophy and practical psychology, examining how both disciplines can meaningfully improve lives.