The 20th century philosopher Charles Sanders Peirce is America's greatest thinker so far. He was a logician, specialized in
- C. S. Peirce's 5 famous The Monist papers
- John N. Deely's "Charles Sanders Peirce and the Recovery of the Signum" and "The Impact of Semiotics on Philosophy"
- Arisbe: The Peirce Gateway
- Dictionary of Peirce's Terms
- Institute for Studies in Pragmaticism
- physicist Peder Voetmann Christiansen's papers on applying Peirce's thought to physics (quantum semiotics)
- cf. also A Triadic Theory of Elementary Particle Interactions and Quantum
- and the related U.S. Patent 6819474.