Wilfrid Stalker Sellars (May 20, 1912 – July 2, 1989) was an American philosopher and prominent developer of critical realism, who "revolutionized both the content and the method of philosophy in the United States".
His father was the Canadian-American philosopher Roy Wood Sellars, a leading American philosophical naturalist in the first half of the twentieth-century. Wilfrid was educated at the University of Michigan (BA, 1933), the University at Buffalo, and Oriel College, Oxford (1934–1937), where he was a Rhodes Scholar, obtaining his highest earned degree, an MA, in 1940. During World War II, he served in military intelligence. He then taught at the University of Iowa (1938–1946), the University of Minnesota (1947–1958), Yale University (1958–1963), and from 1963 until his death, at the University of Pittsburgh. He served as president of the Metaphysical Society of America in 1977. He was a founder of the journal Philosophical Studies.
Sellars is well known as a critic of foundationalist epistemology—the "Myth of the Given" as he called it. However, his philosophical works are more generally directed toward the ultimate goal of reconciling intuitive ways of describing the world (both those of common sense and traditional philosophy) with a thoroughly naturalist, scientific account of reality. He is widely regarded both for great sophistication of argument and for his assimilation of many and diverse subjects in pursuit of a synoptic vision. Sellars was perhaps the first philosopher to synthesize elements of American pragmatism with elements of British and American analytic philosophy and Austrian and German logical positivism. His work also reflects a sustained engagement with the German tradition of transcendental idealism, most obviously in his book Science and Metaphysics: Kantian Variations.
Sellars coined certain now-common idioms in philosophy, such as the "space of reasons". This idiom refers to two things.