Kenneth Macfarlane Walker (1882–1966) was a British author and urologist. Among many other books he wrote The Log of the Ark with Geoffrey Boumphrey in 1923, Life's Long Journey and A Study of Gurdjieff's Teaching. Walker also wrote the book "Meaning and Purpose" - An analysis of the main scientific theories of the last hundred years and their impact upon religious thought and belief, in 1944, aimed at questioning the completeness of "Charles Darwin's" theory of natural selection and evolution, as well as evaluating the most relevant scientific discoveries at the time of publication and their effect on the general population. He studied the ideas and methods of G. I. Gurdjieff with P. D. Ouspensky, and when the latter died in 1947 he visited Gurdjieff himself in Paris. He contributed thoughtful pieces to Picture Post, a highly popular publication, and was referred to by a friend as 'The Sage of Picture Post.' He conducted study groups in the Gurdjieff Society London. Among his books are "A Study of Gurdjieff's Teaching", and "Venture with Ideas." His writing style is simple and direct.