These are the questions Amanda Goodall has been asking for the last twenty years. From boardrooms and F1 race tracks to hospitals and higher education, her research has proven time and again that when it comes to leadership and achieving top performance, we need people - especially bosses - with the expertise that comes only from a deep understanding of the worlds in which they operate. This expertise in our leaders is what makes us feel happier, more motivated and productive. We all want to be led by people we can relate to and trust, those who have the credibility to make us want to follow them. When it comes to leadership, expertise is essential. In Credible, Goodall identifies the key characteristics of expert leaders and provides a new model for career development and success, one where we can achieve our goals and, ultimately, lead more fulfilling lives.