Side effects usually appear early in treatment with any drug, but a basic common sense principle of medicine says that idiosyncratic reactions can happen at any time. I'd be skeptical and would want to examine all drugs that person were taking before I'd reach that conclusion, however. The person needs to be seen and assessed by a physician. Clozapine is in wide use around the country. The NAMI office might be able to help with these types of questions.
Schizophrenia shows no favorites occupationally or socioeconomically.
In fact, given the usual age of onset which is late teens to early twenties, most people with the disease show it before they've had the chance to do much schooling or enter into a professional career. I have been on Zyprexa for over a month now. I have had no further problems. If those symptoms are now gone, perhaps the reason they're gone is because of the new medicine. This is certainly a question you need to discuss with the doctor who prescribed it.