David Devant (22 February 1868 – 13 October 1941) was an English magician and according to magic historian Jim Steinmeyer, David Devant was “England’s greatest magician — and arguably the greatest magician of the 20th Century. " He was the first President of The Magic Circle and the Society celebrates Devant by using his name for their function room in the Headquarters in London. His words about his own priorities in magic have often been quoted to budding young magicians - when confronted by a boastful magician who claimed he knew hundreds of tricks, Devant gently replied that he knew only a few dozen, but he was able to perform them very well. One of his trade mark phrases was that his magic was "All done by kindness" - a phrase that has been adopted by the band David Devant And His Spirit Wife =)
For further information you'll find a full Wikipedia article about David Devant the magician, and you'll find many of his original magic books for sale online. Prices can vary due to the age of the book and if it is a 1st edition or not.