I won't pretend to be good at this, but I had personally typed J. K. Rowling as an INFJ (with little evidence to support it.) I was, however, quite convinced that J. R. R. Tolkien was an SJ, introverted of course. He was a hobbit in real life.
I read part of a biography of Tolkien, and he talked all the time about tradition and how much he hated everything changing. Also, find me an N who would be willing to take up 2/3 of their page space with topography.