WILLIAM WALKER ATKINSON
William Walker Atkinson was a prolific author and a publisher (among other things, including a lawyer and a merchant).
He was an early pioneer of the "New Thought" movement. He also wrote under the pseudonyms "Yogi Ramacharaka" and "Theron Q. Dumont". He was born December 5, 1862 and died November 22, 1932.
Here is one the best sources of information about him: