In our current knowledge economy, many people earn their money by selling their knowledge to clients as trusted advisors. Central to this process is the transfer of knowledge, or knowledge transfer, which implies that today's knowledge worker makes his client and his organization smarter, but also that he himself in turn also becomes smarter as a result. Making yourself smarter is not the same as manipulating or influencing: in the latter activities you make use of someone's weaknesses, while a trusted advisor points out his client's weaknesses and helps him to deal with them better. In this book, Willem Verbeke shows what requirements professionals as knowledge workers must meet to be successful. Knowledge is contained in so-called habitats and it is important that knowledge workers can settle in the higher clay layers of knowledge habitats. Using case studies and real-life examples, Verbeke shows how knowledge workers can achieve that goal, thereby advancing both themselves and their clients. Ultimately, Verbeke shows, selling knowledge requires a form of wisdom: this book puts that wisdom within reach.