Charles S. (Charles Sanders) Peirce

Born in Cambridge, Massachusetts, in 1839, Charles Sanders Peirce grew up in an intensely intellectual world and went on to become one of the most original American philosophers. He also worked as a scientist, mathematician, and logician, and that broad training shows in writing that is rigorous, inventive, and often surprisingly modern.

Peirce is best known for developing pragmatism, a way of testing ideas by looking at their practical consequences, and for pioneering semiotics, the study of signs and meaning. He wrote on probability, inquiry, logic, and scientific method, and his influence reached far beyond philosophy, even though much of his work was not fully appreciated during his lifetime.

He died in Pennsylvania in 1914 after years of financial hardship, leaving behind a vast body of manuscripts and published essays. Later readers and scholars helped establish his reputation as a major figure in American thought and one of the key minds behind modern logic and theories of meaning.