Really hard question?

I need the name of a person who exemplifies “the Age of Anxiety” (1920s), that is not already extremely well-known as representative of the era, like Einstein and his theory of relativity, Heisenberg and his uncertainty principle, Freud with his psychoanalysis, Hemmingway and Farewell to arms, etc. Not expecting any answers to this question, but it would be cool if someone could come up with a couple of names.