Jennifer Hornsby [has written] a series of careful and insightful papers...over the past twenty years. In Simple Mindedness, she does us the great service of collecting twelve of these papers together in a single volume...Her overall picture of the mind is filled out in a helpful introduction, and in a series of useful postscripts...Hornsby disagrees with both Descartes and materialists...She denies that people are composed of a material and an immaterial substance...[but also] denies that mental properties reduce to physical properties...Materialists who put in the time and effort to [weigh Hornsby's views] will be richly rewarded. There is much an orthodox materialist can learn from the heretical Hornsby.