When the rest of the world was just waking up to the possibility of cell phones and the Internet, Tony Fadell was already creating the technology behind the smartphone. Author of more than 300 patents, he sold a microprocessor startup to Apple just as he was leaving college. He spent the next decade pioneering mobile technology for the leading electronics companies, but none would fully commit to marketing the devices he created. When investors passed on Fadell's idea for a pocket-sized digital music player, Steve Jobs recruited him to design just such a product for Apple. Fadell led...