I saw a video last night that was done probably 10 years ago and these guys were sitting there talking about how to turn a human being into a programmable computer. They mentioned working with DNA and adding nano particles that would make the body do what they wanted. They never did mention who would be programming it or how the body would be accessed. It sounded like they figured that science would get to that in time.
There was an earlier posting on FR about how scientists were able to get some nanobots to enter into a rat’s brain. So the groundwork is already being performed.