We can read as a mathunion excerpt that Grothendieck won the Fields medal in 1966
Built on work of Weil and Zariski and effected fundamental advances in algebraic geometry. He introduced the idea of K-theory (the Grothendieck groups and rings). Revolutionized homological algebra in his celebrated "Tohoku paper".
But all of this was already in the proceedings of the congress of 1958.
I would like to know if there are resources to learn why take so much time to give the Fields medal to Grothendieck.
I mean, why he was not awarded the medal in 1962? At that time it was already very clear, that Grothendieck was an outstanding mathematician. He was also not invited to give a talk. Serre would give a talk of his work.
I can imagine the history around, for example, why take some time to give the Nobel prize to Einstein (and why not on relativity!), has a good bibliography or resources here and there... Maybe someone knows something about the case Grothendieck.