Colin Wilson is a renowned authority on the paranormal and is the author of over fifty books, with subjects ranging from mysticism, to criminology. He has also written numerous articles and plays and contributed to several newspapers and journals. He regards himself primarily as a philosopher concerned with the meaning of human existence.
Aside from being a pretty decent introduction to Gurdjieff's life and ideas, Wilson manages to present a novel take on Gurfjieff and the 'Work.' There are so many ways of looking at it all, from Ouspensky's dense and logical essays, to Gurdjieff's own oft-impenetrable tomes.
Wilson also sums up with a critical look at Gurdjieff's ideas and his perpetually troubled relationship with P.D. Ouspensky.