Anyone can be an expert. You need not be a Nobel Prize winner to be one. You just have to be very good at what your are doing and keep on learning and improving. We have experts in every field of work: electricians, air-conditioning technicians, pest-control technicians, auto mechanics, plumbers, writers, teachers, bankers, managers etc. The only difference between experts in a field and the “so-so” practitioners is that experts have conditioned themselves to continuously learn about their  field. Remember,  there is an expert in every field and anyone can be an expert.