About Emil Leon Post
Emil Leon Post was an American mathematician and logician. He is best known for his work in the field that eventually became known as computability theory. As Post said in a postcard to Gödel in 1938: I would have discovered Gödel's theorem in 1921—if I had been Gödel. Post then became a high school mathematics teacher in New York City.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.