Ira A. Noveck received his PhD in Cognitive Psychology from New York University in 1992. He has since held research or teaching positions in Paris, Minneapolis, Montreal and Grenoble. He is currently a full-time research scientist at the institut des Sciences Cognitives in Lyon, France, where he heads a team focusing on the role of pragmatics in reasoning and comprehension Dan Sperber is a French social and cognitive scientist at the Centre National de la Recherche Scientifique (CNRS) in Paris. He is the author of Rethinking Symbolism (1975), On Anthropological Knowledge (1985), Explaining Culture (1996). He is also co-author with Deirdre Wilson of Relevance: Communication and Cognition (1986, 1995). He has held visiting positions at, among others, Cambridge University, the London School of Economics and Political Science, the Institute for Advanced Study in Princeton, Princeton University, and the University of Michigan.