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Saul Aaron Kripke (born in November , 1940 , Omaha , Nebraska ) is an American Philosopher and Logician now emeritus from Princeton and professor of philosophy at CUNY Graduate Center . He has been immensely influential in a number of fields related to Logic and Philosophy Of Language . Much of his work remains unpublished or exists only as tape-recordings and privately circulated manuscripts. He is nonetheless widely regarded as the foremost living philosopher. Former student and later colleague, philosopher Nathan Salmon , has said of Kripke that "he is the most ingenious and the most insightful living philosopher, and even saying this much underdescribes him. He is a phenomenon." Kripke was the winner of the 2001 Schock Prize in Logic and Philosophy. BIOGRAPHY Saul Kripke is the oldest of three children born to Dorothy and Rabbi Myer Kripke. His father was the leader of Beth El Synagogue, the only Conservative congregation in Omaha. His mother wrote Jewish educational children's books. Saul and his two sisters, Madeline and Netta, attended Dundee Grade School in Omaha and Omaha Central High School . After graduating from high school in 1958, Kripke attended Harvard University . Before becoming a professor at Princeton University , Kripke taught in the Philosophy department at Rockefeller University in New York City . Kripke married (and recently divorced) Margaret Gilbert whose brother Martin Gilbert is a well-known British historian. They have no children. He currently teaches courses in Logic , Metaphysics , and the Philosophy Of Language at the CUNY Graduate Center in midtown Manhattan. WORK Kripke is best known for four contributions to philosophy: # Semantics for Modal (and Related) Logics , published in several essays beginning while he was in his teens. # His 1970 (published in 1972 and 1980) Princeton lectures ''Naming and Necessity'', which significantly restructured Philosophy Of Language and, as some have put it, "made metaphysics respectable again." # His interpretation of the philosophy of Wittgenstein . # His Theory Of Truth . MODAL LOGIC Two of Kripke's earlier works (''A Completeness Theorem in Modal Logic'' and ''Semantical Considerations on Modal Logic'') were very influential to Modal Logic . The most familiar logics in the modal family are constructed from a weak logic called K, named after Kripke because of his contributions to modal logic. In ''Semantical Considerations on Modal Logic'', published in 1963 , Kripke responded to a difficulty with classical Quantification Theory . The whole motivation for the world-relative approach was to reflect the idea that objects in one world may fail to exist in another. If standard quantifier rules are used, however, every term must refer to something that exists in all the possible worlds. This seems incompatible with our ordinary practice of using terms to refer to things that only exist contingently. Kripke's response to this difficulty was to eliminate terms. He gave an example of a system that uses the world-relative interpretation and preserves the classical rules. However, the costs are severe. First, his language is artificially impoverished, and second, the rules for the propositional modal logic must be weakened. NAMING AND NECESSITY Kripke's three lectures constitute an attack on the descriptivist ( in which the object exists. Causal theories of reference have since been elaborated and developed by Michael Devitt , Keith Donnellan , Gareth Evans , David Kaplan , Hilary Putnam , Nathan Salmon , Scott Soames , and others, and are perhaps more widely held than descriptivist theories now. Notable holdouts include Alonzo Church and John Searle . Kripke also raised the prospect of ''a Posteriori'' Necessities —facts that are necessarily true, though they can be known only through empirical investigation. Examples include “Hesperus is Phosphorus”, “Cicero is Tully”, and other identity claims where two names refer to the same object. Finally, Kripke gave an argument against Identity Materialism in the Philosophy Of Mind , the view that every mental fact is identical with some physical fact (''See talk''). Kripke argued that the only way to defend this identity is as an ''a posteriori'' necessary identity, but that such an identity—e.g., pain is C-fibers firing—could not be necessary, given the possibility of real honest-to-goodness pain that has nothing to do with C-fibers firing. Similar arguments are defended today by David Chalmers . Kripke delivered the John Locke Lectures in philosophy at Oxford in 1973 . Titled ''Reference and Existence'', they are in many respects a continuation of ''Naming and Necessity'', and deal with the subjects of Fictional Names and perceptual error. They have never been published and the transcript is officially available only in a reading copy in the university library, which cannot be copied or cited without Kripke's permission. In fact many copies are informally circulated among philosophers. Its influence, though considerable, is thus difficult to trace. However, it has been extensively referred to by some philosophers, particularly Gareth Evans and Nathan Salmon . WITTGENSTEIN Kripke also made interesting contributions to the study of the later Wittgenstein in lectures published as ''Wittgenstein on Rules and Private Language'', although his work here has been faulted for being not particularly true to the historical Wittgenstein. Indeed, many philosophers refer to the subject of Kripke's book as " Kripkenstein ," on the grounds that the argument it presents would not have been endorsed by Wittgenstein. (For alternative readings of Wittgenstein, see Colin McGinn's ''Wittgenstein on Meaning''.) Kripke's book has also been faulted for not giving credit to other authors who interpreted Wittgenstein similarly (see Robert J. Fogelin's ''Wittgenstein''). Kripke's influence has been substantial, but much of his work, unfortunately, exists only in tape-recorded or transcript form. TRUTH In his 1975 article "Outline of a Theory of Truth", Kripke showed that a language can consistently contain its own Truth predicate, which was deemed impossible by Alfred Tarski , a pioneer in the area of formal theories of truth. The trick involves letting truth be a partially defined property over the set of grammatically well-formed sentences in the language. Kripke showed how to do this recursively by starting from the set of expressions in a language which do not contain the truth predicate, defining a truth predicate over just that segment: this adds new sentences to the language, and truth is in turn defined for all of them. Unlike Tarski's approach, however, Kripke's lets "truth" be the union of all of these definition-stages; after a denumerable infinity of steps the language reaches a "fixed point" such that using Kripke's method to expand the truth-predicate does ''not'' change the language any further. Such a fixed point can then be taken as the basic form of a natural language containing its own truth predicate. But this predicate is undefined for any sentences that do not, so to speak, "bottom out" in simpler sentences not containing a truth predicate. That is, "'Snow is white' is true" is well-defined, as is "'"Snow is white" is true' is true," and so forth, but neither "This sentence is true" nor "This sentence is not true" receive truth-conditions; they are, in Kripke's terms, "ungrounded." MEANING OF "I" In late January 2006 Kripke attended a conference celebrating his 65th birthday and work at the Graduate Center of the City University of New York, and delivered a 70-minute talk on "The First Person", discussing the meaning and reference of the pronoun "I". (New York Times Jan.28, 2006). EXTERNAL LINKS
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