John Venn

John Venn, FRS, FSA, (4 August 1834 – 4 April 1923) was an English logician and philosopher. He introduced the Venn diagram. The Venn diagram is one of many ways to represent logical relationships. It is well-known because it is easy to understand, and is used in elementary set theory, probability, logic, statistics, competition math, and computer science.
In 1883, Venn was elected a Fellow of the Royal Society. In 1884, he was awarded a Sc.D. by Cambridge.