Peter D. Ouspensky , was a Russian philosopher who invoked euclidean and noneuclidean geometry in his discussions of psychology and higher dimensions of existence.
Ouspensky is well-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 his thirty-eighth year. Eventually he separated from Gurdjieff personally, and it is said that he finally gave up the "system" that he had shared with people for 25 years in England and America, but this is unclear if one goes from his own recorded words on the subject and not from the statements of others. In London while lecturing in 1924, he made the announcement he would continue independently the way he began in 1921.