This chapter concerns itself with the Sophists’ professional activities. Their professionalism – especially the claim that they were first to teach for pay – has often been used as the only meaningful characteristic to distinguish them from other wisdom experts. When reviewing the evidence for their professional activities, however, a different picture emerges, one in which the Sophists appear to be less exceptional and more embedded in a broader economy of wisdom than has hitherto been realized. The chapter reviews the primary sources and discusses the difficulty of reconstructing the Sophists’ professional lives based on authors who, like Plato, seem hostile and frequently mention the Sophists in invective contexts. By paying attention to the Sophists’ professional activities, we can gain a better understanding of their social position and the cultural legitimacy accorded them by their contemporaries. How we interpret their professional activities can further help shape our understanding of their contribution to Greek philosophy and their intellectual legacy.