Many open questions that affect our society and make us worry about the future revolve around a fundamental problem: figuring out who is really experienced in a given area and, as a result, deciding who we can trust. It is inevitable that each of us will have to place our trust in other individuals when it comes to issues such as global warming and environmental protection, medical therapies to be subjected to, cybersecurity and the education of our children. But how should we choose the people we trust? And what should we do when the expert's opinion deviates from our opinion? The book aims to answer these questions by offering an original and innovative interpretation of the current debate on the notions of expert and authority in the philosophy of knowledge and in the moral philosophy of an analytical matrix.