I first found out about Maurice Wilson, oddly enough, from a wonderful little fictional work called Skepticism Inc, by Bo Fowler. I wasn't sure whether the story was at all accurate or even if it was pure fiction, but it didn't much matter. It was funny, and apposite to the mindset of the book.
Then a month or so back, I read an excellent book on the history of Everest mountaineering by George Band, a member of the successful 1955 expedition. The book mentioned Maurice Wilson, confirming, in a completely unexpected manner, that Maurice was real.
Here's how Skepticism Inc describes Maurice Wilson: