About the Author

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Jon Barwise (1942-2000) was a mathematician, philosopher and logician. He taught at the Universities of Yale and Wisconsin before becoming the first director of the Center for the Study of Language and Information at Stanford University. From 1990 until his death he was professor of philosophy at Indiana University. John Etchemendy has been professor of philosophy at Stanford since 1983. In 2000 he became Provost of Stanford University.