Ejnar Hertzsprung and Henry Russell H for Hertzsprung and R for Russell
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It was invented in July 1880
Sankey diagram is named after Irish Captain Matthew Henry Phineas Riall Sankey. He first used this type of diagram in 1898.
The mathematical Carroll diagram was developed by Lewis Carroll. Carroll studied at the University of Oxford and later became a teacher of mathematics at Oxford.
I think it would be pretty safe to say he invented the Venn Diagram