Pundit

A pundit (sometimes also called a talking head) is a person who offers to mass media his or her opinion or commentary on a particular subject area (most typically political analysis, the social sciences, technology or sport) on which he or she is knowledgeable (or can at least appear to be knowledgeable), or considered a scholar in said area. The term has been increasingly applied to popular media personalities. In certain cases, it may be used in a derogatory manner as well, as the political equivalent of ideologue.