History of twentieth-century philosophy of science opens with an introduction to contemporary philosophy of science as of the beginning of the twenty-first century, and describes the new specialty of computational philosophy of science. Seven chapters describing the philosophies of several major philosophers of science follow this introductory chapter. These major philosophers include Ernst Mach and Pierre Duhem, Rudolf Carnap and Willard Van Quine, Werner Heisenberg, Karl Popper, Thomas Kuhn and Paul Feyerabend, Norwood Russell Hanson, and Paul Thagard and Herbert Simon. The book concludes with a large bibliography.