Both Stephen R. Donaldson and P. D. Ouspensky are known for esotericism?
P. D. Ouspensky Pyotr Demianovich Ouspenskii (known in English as Peter D. Ouspensky, Пётр Демья́нович Успе́нский; 5 March 1878 – 2 October 1947), was a Russian mathematician and esotericist known for his expositions of the early work of the Greek-Armenian teacher of esoteric doctrine George Gurdjieff, whom he met in Moscow in 1915. He was associated with the ideas and practices originating with Gurdjieff from then on. He shared the (Gurdjieff) "system" for 25 years in England and the United States, having separated from Gurdjieff in 1924 personally, for reasons he explains in the last chapter of his book "In Search of the Miraculous".
Weird fiction Weird fiction is a subgenre of speculative fiction originating in the late 19th and early 20th centuries. It can be said to encompass the ghost story and other tales of the macabre. Weird fiction is distinguished from horror and fantasy in its blending of supernatural, mythical, and even scientific tropes. British authors who have embraced this style have often published their work in mainstream literary magazines even after American pulp magazines became popular. Popular weird fiction writers included Edgar Allan Poe, William Hope Hodgson, H. P. Lovecraft, Lord Dunsany, Arthur Machen, M. R. James, and Clark Ashton Smith.