Von Neumann's mathematical analysis of the structure of self-replication preceded the discovery of the structure of DNA. In a short list of facts about his life he submitted to the National Academy of Sciences, he stated "The part of my work I consider most essential is that on quantum mechanics, which developed in Göttingen in 1926, and subsequently in Berlin in 1927–1929. Also, my work on various forms of operator theory, Berlin 1930 and Princeton 1935–1939; on the ergodic theorem, Princeton, 1931–1932."
Von Neumann's study of what preceded the discovery of DNA? What part of his work did Von Neumann consider to be his most important? Where was quantum mechanics developed? What work did Von Nemann do in Berlin in 1930 and Princeton 1935 - 39? What was the topic of Von Neumann's work at Princeton in 1931 - 32?