This book, based on Jaegwon Kim's 1996 Townsend Lectures, presents the philosopher's current views on a variety of issues in the metaphysics of the mind -- in particular, the mind-body problem, mental causation, and reductionism. Kim construes the mind-body problem as that of finding a place for the mind in a world that is fundamentally physical. Among other points, he redefines the roles of supervenience and emergence in the discussion of the mind-body problem. Arguing that various contemporary accounts of mental causation are inadequate, he offers his own partially reductionist solution on the basis of a novel model of reduction. Retaining the informal tone of the lecture format, the book is clear yet sophisticated.