His name was Paul Brunton.
Perhaps you have never heard of him, but I gather he was pretty well known in his day. He wrote many books in the course of a long lifetime of study (1898-1981).
Recently I was moved to read A Search in Secret Egypt, which had sat unread on my shelves for many years. After the first chapter, which was somewhat slow, the book captivated me, and so I went looking to see what else he had written. I used my birthday money (i.e. gift certificate to amazon) to buy a two-volume set, two books originally published in the 1940s.
To my amazement, this examination into the true nature of our lives amid the world around us and within us repeatedly comes out with quite counter-intuitive statements that could have come straight from the guys upstairs, or Rita, or Nathaniel. Time after time, so that I hardly have to follow the logic of his presentation, because intellectually I am already where he wants to bring the reader. Unbelievable experience.
The Hidden Teaching Beyond Yoga and The Wisdom of the Overself, by Paul Brunton, apparently functioning as TGU while still occupying a body. Amazing books.