Astonishing work, about which many words have already been written. I don’t really want to add to them other than to point out it’s hard to believe that these rivetting 500 pages are all true. More or less, and closer to more than less, that is.
Here is a link to a 1995 PhD by Sharon Clarke which is the most information we have about his life and work.
There is a movie, which is available on Youtube at the moment. Not sure how to see it otherwise.