Professor Preston is qualified in artificial intelligence, as well as philosophy, and his main research interests are in the history of philosophy (especially Ludwig Wittgenstein, Ernst Mach, and associated late nineteenth and early-to-mid-twentieth-century philosophers and philosopher-scientists, such as Ludwig Boltzmann and Heinrich Hertz), the Vienna Circle (Logical Positivists and their Logical Empiricist successors), Karl Popper, Thomas Kuhn, Paul Feyerabend, philosophy of science, epistemology, and classical Chinese philosophy.-faculty profile