Quora Answer: How is a Rhetorician Different from a Public Speaker?

The following is my answer to a Quora question: “How is a rhetorician different from a public speaker?” 

A rhetorician is an expert in the art of rhetoric.  All rhetoricians are good public speakers because rhetoric is the foundation of public speaking.  Most public speakers simply speak in public.  They may be comfortable with it, they may lack any sense of fear or apprehension, but it does not mean they are good speakers.  In fact, most public speakers do not even have the foundations of the art of rhetoric, let alone mastering it.