Henry Maurice Dunlop Nicoll (19 July 1884 – 30 August 1953) was a Scottish neurologist, psychiatrist, author and noted Fourth Wayesoteric 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.
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