From the history of maths
Lewis Carroll
As Charles Dodgson he lectured in mathematics at Christ Church, Oxford, and as Lewis Carroll he wrote Alice’s Adventures in Wonderland.
He published Pillow Problems, puzzles to work out in your head while lying awake. This is his self-portrait photograph.

Lewis Carroll, Public domain, via Wikimedia Commons
Where you’ll meet Carroll here
LogicProbability
They turn up beside problems and lessons on these topics.
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Alan Turing
His 1936 paper on computable numbers described the Turing machine, the idea behind every computer.
He led codebreaking work on Enigma at Bletchley Park, and appears on the Bank of England £50 note.

Elliott & Fry, Public domain, via Wikimedia Commons