I am interested in the Socratic idea that the good life is a life of investigation, or, more generally speaking, in the relationship between virtue and knowledge. The question of how we can understand this relationship motivates my current book project, "The Ethics of Belief." I explore the Socratic intuition that belief, as opposed to knowledge, is ethically bad, and the various treatments of this idea in Plato, the Sceptics, Stoics, and Epicurus. Another project is tentatively entitled "Desiring the Good." Here, I draw on ancient and contemporary theories of motivation, arguing for a version of the so-called Socratic Paradox - that everyone desires the good.
My recent book, Law, Reason, and the Cosmic City (2008) aims to locate early Stoic political philosophy centrally within Stoic philosophy; I discuss Stoic thought about wisdom, cosmopolitanism, the law, and theology. I became interested in the Stoics initially by studying Hellenistic logic and epistemology, which brought me to Sextus Empiricus. My dissertation and first book is on belief, language, and action in Pyrrhonian Scepticism, Skepsis und Lebenspraxis (1998). My research interests in ethics include the philosophy of friendship, and Kantian ethics (in particular, those objections to the Kantian outlook that might induce one to give up on it). My work on Kant focuses on Kant's rationalism, as well as his conceptions of duty and of virtue in the Metaphysics of Morals.