The first comprehensive history of John Venn's life and work. John Venn (1834-1923) is remembered today as the inventor of the famous Venn diagram. The postmortem fame of the diagram has until now eclipsed Venn's own status as one of the most accomplished logicians of his day. Praised by John Stuart Mill as a "highly successful thinker" with much "power of original thought," Venn had a profound influence on nineteenth-century scientists...