This book concerns the future of the mind. It’s about how our understanding of ourselves, our minds, and our nature can drastically change the future, for better or for worse. Our brains evolved for specific environments and are greatly constrained by anatomy and evolution. But artificial intelligence (AI) has opened up a vast design space, offering new materials and modes of operation, as well as novel ways to explore the space at a rate much faster than biological evolution. I call this exciting new enterprise mind design. Mind design is a form of intelligent design, but we humans, not God, are the designers.