D. K. Lewis

D. K. Lewis, often known as David Kellogg Lewis, was an influential American philosopher recognized for his work in metaphysics, epistemology, and philosophy of language. He is particularly known for his theory of modal realism, which asserts that all possible worlds are as real as the actual world we inhabit. This idea challenges traditional views of possibility and necessity. Lewis also contributed significantly to debates on convention, meaning, and counterfactuals—statements about what could have happened under different circumstances. His ideas have prompted extensive discussion and have shaped modern philosophical thought.