Both Public Intellectuals and Thought Leaders engage in acts of intellectual creation, but their style and purpose are different. To adopt the language of Isaiah Berlin, Public Intellectuals are foxes who know many things, while Thought Leaders are hedgehogs who know one big thing. The former are skeptics, the latter are true believers. A Public Intellectual will tell you everything that is wrong with everyone else’s ideas. A Thought Leader will tell you everything that is right about his or her own idea.