In scientific manner I think that it depends on how long the person you're trying to reanimate has been dead. Let's say it was only a couple or so days after death, then he would have all his memories and personality. Given more time, like a month or more, I doubt it. Maybe only fragments of what have been or he wouldn't remember anything at all, and be reanimated as just a mindless beast. Of course, first of all a way to safely reanimate corpses has to be found.