Henry Maurice Dunlop Nicoll (19 July 1884 – 30 August 1953) was a Scottish neurologist, psychiatrist, author and noted Fourth Way esoteric teacher. He is best known for his Psychological Commentaries on the Teaching of Gurdjieff and Ouspensky, a five-volume collection of more than 500 talks given and distributed to his study groups in and around London from March 1941 to August 1953.
https://en.wikipedia.org/wiki/Maurice_Nicoll