In order to enhance understandings of the international mobility of researchers and the implications of their mobility for knowledge production and circulation, we need to develop more sophisticated conceptual resources. Here we draw on and seek to develop ideas generated from literary theory and geography in order to highlight the links between internationally mobile researchers, knowledge, geography and power. In particular, we develop three interrelated concepts: "geographies of power/knowledge", "empires of knowledge", and "edges of empires". We also turn to Edward Said's notion of the "exilic intellectual" because it speaks to the manner in which some mobile individuals navigate this terrain, as well as to issues of their links to place, positionality and the academy. The paper puts these concepts to work as we ask "What do they look like through the lens of an individual's intellectual biography?" and "How can a biography add nuance to the concepts?" Overall we adopt what Said calls a "worldly" perspective that involves considering the time and place of ideas. (Contains 13 notes.)