P. D. Ouspensky
Pyotr Demianovich Ouspenskii , was a Russian mathematician and esotericist known for his expositions of the early work of the GreekArmenian 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 system foryears 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.
Ouspensky was born in Moscow in 1878. In 1890, he was studying at the Second Moscow Gymnasium, a government school attended by boys fromto 18. At the age of 16, he was expelled from school for painting graffiti on the wall in plain sight of a visiting inspector thereafter, he would be more or less on his own. In 1906, he was working in the editorial office of the Moscow daily paper The Morning. In 1907 he discovered Theosophy. In the autumn of 1913, age 35, before the beginning of World War I, he journeyed to the East in search of the miraculous, visited Theosophists in Adyar but was forced to return to Moscow after the beginning of the Great War. There he met George Gurdjieff and married Sophie Grigorievna Maximenko. He had a mistress by the name of Anna Ilinishna Butkovsky.
Source: Wikipedia