|My own small Featherstone collection|
For those who don't recognize the name, Donald Featherstone is one of the founding figures of modern miniatures wargaming. He wrote more that 40 books on the subject, edited War Game Digest, held the first wargaming convention in the UK, and generally inspired literally generations of gamers. Certainly the fathers of the roleplaying side of the hobby owe him a huge debt.
His books (pictured) were the first I ever bought on the subject of miniatures gaming, at a used bookstore for the princely price of $2 each. I've never met him and never corresponded with him, but I will still miss him.