Ian Rumfitt

Ian Rumfitt is a British philosopher specializing in the philosophy of language and philosophy of mathematics. He is a senior research fellow at All Souls College, Oxford. His research interests include the philosophy of logic, the philosophy of language, metaphysics, model theory, and the philosophy of mathematics, with a particular interest in Gottlob Frege. Rumfitt's work has focused on defending classical logic against philosophers like Michael Dummett and Crispin Wright, even while sometimes rejecting the principle of bivalence. His book, "The Boundary Stones of Thought" (2015), presents a non-classical semantic theory that nonetheless validates classical logic. He has also addressed the Sorites paradox and defended Kripke–Platek set theory. Earlier work includes formalizations of classical logic, and contributions to the philosophy of language concerning plural terms, conditionals, and indirect speech reports, exploring the relationship between truth-conditional and intention-based theories of meaning.