author
John Venn
1834–1923
Best known for the simple overlapping circles that still bear his name, this English logician helped make abstract ideas visible. He was also a Cambridge scholar whose work ranged from logic and probability to university history.
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About the author
Born in Kingston upon Hull in 1834, John Venn became one of the most recognizable names in logic thanks to the diagrams he introduced for showing relationships between sets and classes. Those Venn diagrams remain widely used because they turn difficult reasoning into something people can grasp at a glance.
Venn studied at Gonville and Caius College, Cambridge, and spent most of his career there. He was a fellow of the college, lectured in moral sciences, and wrote important books on logic and probability, including The Logic of Chance and Symbolic Logic.
Later in life, his interests broadened beyond formal logic. He worked on the history of Cambridge and the records of its students and graduates, showing the same careful, orderly mind that shaped his logical writings. He died in Cambridge in 1923, but his name lives on in one of the most familiar visual tools in mathematics and philosophy.