I didn’t read this novel that long ago, yet I can't really remember what it is about. Now that I think of it, for some reason it kind of reminded of me of Vonda McIntyre's "Dreamsnake" but I'm not sure why.
I think it's because they both involve a quest in a post-apocalyptic Earth. In both books the antagonist is some sort of mutant. In "Einstein" everyone is a mutant.
I can't believe it won the Nebula in 1967, it must of been slim pickings that year.