Born On Your Day
John Venn
Unknown (Maull & Fox. studio), Public domain, via Wikimedia Commons

scientistauthor

John Venn

Author · born August 4, 1834 · died 1923

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About

John Venn, FRS, FSA was an English mathematician, logician and philosopher noted for introducing Venn diagrams, which are used in logic, set theory, probability, statistics, and computer science.

Adapted from Wikipedia (CC BY-SA 4.0).

Milestones, by age

Dated facts from Wikidata; ages marked “about” come from year-only dates.

  1. ~24Became chaplain1858
  2. ~49Received the Fellow of the Royal Society1883

Sources

Every fact on this page traces to one of these.

Sources (2)

Also born on August 4

John's most notable birthday twins

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Meg Whitman

Entrepreneur · Hewlett-Packard · software

1956 · United States

$4.1Bolder estimate, as of 2025 · Forbes

Margaret Cushing Whitman is an American business executive, diplomat and politician. She served as the United States ambassador to Kenya from July 2022 to November 2024 under President Joe Biden.

United States Department of State, Public domain, via Wikimedia Commons

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billionaire

Giorgos Economou

Greek shipbuilder and art collector

1953 · Greece

$1.5Bolder estimate, as of March 2015 · Bloomberg

George Economou or Georgios Ekonomou is a Greek billionaire shipowner, CEO of DryShips Inc. and Ocean Rig, and the owner of Cardiff Marine. Economou owns oil tankers as well as dry bulk ships and manages them through Cardiff Marine.

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Barack Obama
politician

Barack Obama

Politician

1961 · United States

Barack Hussein Obama II is an American politician who served as the 44th president of the United States from 2009 to 2017. A member of the Democratic Party, he was the first African American to serve as president.

Official White House Photo by Pete Souza, Public domain, via Wikimedia Commons

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