Clear Blue Tomorrows

In the future, the entire population is under a de facto dictatorship because of cerebral implants invented by one F. G. Wilson. Nolan Ska, an engineer, manages to travel back in time, with the intention of changing history by encouraging Wilson first career: novelist. But the man who will eventually become a seemingly immortal despot turns out to be a poor writer, and it will be up to Nolan to use his own memories to be his ghost writer...