Mainstream professional philosophers of mind should perhaps feel humbled by the fact that while they have been satisfied for the most part with hanging on the coattails of currently fashionable theories in cognitive science and artificial intelligence, it has largely been left to those outside the profession, like David Hodgson, to pursue the most profound metaphysical questions concerning the relations between mind and matter - questions which cannot even be begun to be addressed adequately without an understanding, such as Hodgson has taken so many pains to acquire, of the most successful theory of matter that humanity has ever devised.