This is a post to test how https://whtwnd.com works for blog articles.
His 1936 treatise on the universal machine stands as a pillar of computer science today with its proposition that you can have a general-purpose device to run a variety of programs rather than something contrived for a single purpose.
Also he made the Turing machine. And he coined the Turing test.
For further reading, I recommend the Alan Turing Wikipedia page.