Charles Sanders Peirce 1839 – 1914

Charles Sanders Peirce was a 19th and early 20th-century American philosopher, logician, mathematician, and scientist, regarded as the founder of pragmatism and one of the most original thinkers in the American philosophical tradition. His pragmatic maxim, formulated in How to Make Our Ideas Clear in 1878, holds that the meaning of any idea consists in the conceivable practical effects of its object. He made foundational contributions to formal logic, semiotics, and the philosophy of science, and developed an elaborate metaphysical system in his later work. Despite his philosophical importance he led a difficult professional life and never held a permanent academic position. His vast manuscript archive has been edited and published over the past century, securing his place as a major figure of modern philosophy.

Charles Sanders Peirce (1839–1914) was the most original philosophical mind in nineteenth-century America and the founding figure of pragmatism, semiotics, and a substantial body of work in formal logic and the philosophy of science. The son of the Harvard mathematician Benjamin Peirce, he worked for thirty years as a scientist for the United States Coast and Geodetic Survey while producing his philosophical work largely in private.

Peirce coined the term pragmatism in a series of articles for Popular Science Monthly in 1877–1878, including How to Make Our Ideas Clear. The pragmatic maxim — that the meaning of a concept lies in the totality of its testable consequences within a community of inquiry tending toward truth in the long run — is the philosophical core of his work. When William James adopted the term and developed it in directions Peirce found unacceptable, Peirce renamed his own position pragmaticism, a name ugly enough that no one would steal it.

Peirce's contributions to logic — the algebra of relations, the existential graphs, the development of modern quantification — were largely independent of and parallel to Frege's. His semiotics distinguished icon, index, and symbol and grounded a comprehensive philosophical theory of signs. He was dismissed from Johns Hopkins in 1884 over a personal scandal and never held another academic position; he died in poverty in 1914 with his major philosophical works unpublished. The slow recovery of his work has been one of the major editorial projects of twentieth- and twenty-first-century American philosophy.