The possible relation of an individual's personality structure and the choice of occupation he makes is an intriguing study. Periodically interest in this general area waxes; recently there has been some work done on the personality determinants involved in intellectual work (for examples, see 1, 4, 13, 14, 15, 16). In the case of science and philosophy, this may be related to what type of scientific or philosophic work the individual thinks should be done, what areas he feels should be studied, and even what he takes science or philosophy to be. The purpose of this paper is first to consider briefly some representative statements about the effect of personality factors on one's approach to science, and then go on to a more thorough treatment of the philosopher's personality and the type of philosophy he does.