Chip Walter is an author, National Geographic Explorer, filmmaker and former CNN bureau chief with an unusually broad background that spans both science and entertainment. Chip has written and sold multiple screenplays during his career, but his sixth book, Doppelgänger, is his first novel, a science fiction thriller that explores a post-dystopian world where it has become possible to download a human mind into a cyborg, and where artificial intelligence approaches human consciousness. Its main character is faced with solving his own murder. 

Chip's earlier books include Immortality, Inc. -- Renegade Science, Silicon Valley Billions, and the Quest to Live Forever for National Geographic and is available in bookstores everywhere. Salon's review: “Walter has clearly gained the trust of some of the most innovative and imaginative thinkers of the early 21st century, and in doing so he's able to offer the reader a glimpse inside their minds. And what we find there is certainly colorful. Whatever one thinks of the quest for immortality, it is impossible not to be intrigued by it”. The Wall Street Journal wrote, “While Immortality, Inc. is focused on aging and the efforts to defy it, the book is also a gripping chronicle of private-sector experimentation and ingenuity.” “Witty … worth the ride,” wrote Nature, and Publisher’s Weekly calls the book, “Fascinating.” It was chosen one of the nation’s top six science books by Malcolm Gladwell’s Next Big Idea Club.