There seems to be a bit of lack of knowledge about Freeman Dyson. Freeman Dyson is the person responsible for legitimization and adoption of Feynmann diagrams,

There seems to be a bit of lack of knowledge about Freeman Dyson. Freeman Dyson is the person responsible for legitimization and adoption of Feynmann diagrams, via proof of equivalence with Schwinger's methods. Feynmann didn't care about why his methods worked, Dyson did. Think a brilliant hacker (Feynmann) who basically points to a working system in a new programming language and says "Look it works. What more do you want? Clearly this is because of my awesome new language." and another engineer (Dyson) trying to get him to document the damn thing, explain how it works in terms of previous programming paradigms, and then discovers failure modes in the process. As usual, the engineer who did the documentation gets a bit of short shrift of the glory. Now, this of course does not mean that he's right about this issue; but please do do not disregard his honesty or truly tremendous contributions to human knowledge. https://en.wikipedia.org/wiki/Freeman_Dyson https://en.wikipedia.org/wiki/Freeman_Dyson