I have a problem with a cyber stalker whose sole intention is to ruin me personally and professionally. How can one protect themselves legally?
You could be the victim of defamation (which includes libel)
Libel is a method of defamation expressed by print, writing, pictures, signs, effigies, or any communication embodied in physical form that is injurious to a person's reputation, exposes a person to public hatred, contempt or ridicule, or injures a person in his/her business or profession. Definition of Libel
but it depends on what exactly is in the communications that this person is writing and emailing to others. He must be making false statements that he claims are true. That can be libel.
There are four criteria used today for Defamation in the United States:
- The statement was false, but was claimed as true.
- The statement must have been made to a third, previously uninvolved party.
- The statement must have been made by the accused party.
- The statement caused harm.
If you are not a public figure - like a politician or Hollywood star - the threshold is lower for defamation, i.e. it's easier for him to libel you.
We can't offer legal advice here, and I am not a lawyer, but you can contact a lawyer or a free legal help clinic with the contents of the emails and be able to state (or be able to prove) what you feel are the damages to your business ventures. A lawyer can make the call if this is indeed defamation and your what your options might be.