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Matt,
Unfortunately, I don't know WHO. However, I had such a calendar for 2011. I believe it's been recycled (I'm TRYING to save less 'junk'), but you should be able to find them for sale somewhere.
The one I had contained a cute story about the poor little square root of -1, who felt totally left out and laughed at by the other numbers -- until it was shown that e**(i*pi) + 1 = 0. Little i showed those other numbers what was what!
Dale
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Are you looking for Martin Gardner? He wrote the Mathematical Games column for Scientific American for many years.
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I think a mathematician named Theoni Pappas puts these out every year, or at least used to. Search for her and you'll find it.