I have heard it said that “an expert is someone from out of town with Power Point.” This expression has some old roots. When I originally heard it, it was “someone from out of town with overhead slides.”
Apparently nowadays you do not even have to travel to become an expert. A young lawyer contacted me recently to ask me my views on the legal profession because he had been told by the Managing Partner of his firm that I was an expert on the profession, a status that I appear to have achieved by ranting on social media.