Over the past few weeks I’ve been thinking about how much someone has to know to be considered an expert in their field and I’ve come to the conclusion that defining someone’s expertise is not easy. Take a doctor as an example; let’s say that this particular doctor is a neurosurgeon, quite possibly one of the most skilled and trained of all doctors, and that this doctor has been practicing for 10 years in his field. At that point I’d probably have no problem saying that they’re a neurological expert; however, that does not make him an expert podiatrist.