This chapter reviews Collins and Evans’ “Periodic Table of Expertises” and applies its expanded model of expertise to geographical expertise—the area of expertise related to places. Taking the position that expertise can be acquired through both experience and formal training, this chapter explores how thinking about geographic knowledge and expertise has evolved to encompass both place-based and process-based dimensions. Specifically, it demonstrates how recent developments in mobile phone and geolocation technologies change the dimensional reconstruction of particular forms of geographic expertise.