Robert C. Stalnaker is a Professor of Philosophy at the Massachusetts Institute of Technology and is a Fellow of the American Academy of Arts & Sciences. In 2007, he delivered the John Locke Lectures at Oxford University on the topic of "Our Knowledge of the Internal World."
His work concerns, among other things, the philosophical foundations of semantics, pragmatics, philosophical logic, decision theory, game theory, the theory of conditionals, epistemology, and the philosophy of mind. But all of these interests are in the service of addressing the problem of intentionality, "what it is to represent the world in both speech and thought". In his work, he seeks to provide a naturalistic account of intentionality, characterizing representation in terms of causal and modal notions.
Along with Saul Kripke, David Lewis, and Alvin Plantinga, Stalnaker has been one of the most influential theorists exploring philosophical aspects of possible world semantics. According to his view of possible worlds, they are ways this world could have been, which in turn are maximal properties that this world could have had. This view distinguishes him from the influential modal realist Lewis, who argued that possible worlds are concrete entities just like this world.
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