Philip José Farmer (1918-2009) was an award-winning science fiction author who wrote more than 70 novels. He is best known for the Riverworld series of books and the fan-favorite The World of Tiers series. Farmer often mixed real and fictional elements in his books, as epitomized by his Wold Newton series. In 2001, he was awarded the Grand Master Prize from the Science Fiction and Fantasy Writers of America and won a World Fantasy Lifetime Achievement Award.