Yves R. Simon (1903-1961) was one of this century's greatest students of the virtue of practical wisdom. Simon's interest in this virtue ranged from ultimate theoretical and foundational concerns, such as the relationship between practical knowledge and science, to the most concrete and immediate questions regarding the role of practical wisdom in personal and social decision-making. These concerns occupied Simon from his earliest published writing to the final notes and correspondence he was working on at the moment of his untimely death. Throughout his life, practical wisdom and its related...