Philip José Farmer was a bold and imaginative science fiction and fantasy writer best known for pushing boundaries—both literary and thematic. His work often explored taboo subjects like sexuality, religion, and identity, blending pulp adventure with philosophical depth. With groundbreaking series like Riverworld and World of Tiers, Farmer challenged conventions and expanded the possibilities of genre fiction. Inventive, provocative, and deeply human, he remains a trailblazer who reshaped the landscape of speculative storytelling.