Summary: A psychological profile of former Massachusetts governor Mitt Romney, developed at the Unit for the Study of Personality in Politics during Romney’s 2008 and 2012 presidential campaigns, reveals that the Republican nominee is highly conscientious, with a personality type best described as a “dutiful conformist.” Specifically, Romney is primarily a Conscientious-dutiful personality, complemented by secondary Dominant-asserting, Ambitious-confident, and Accommodating-cooperative features and a minor Retiring-reserved tendency. Romney’s personality profile provides a stable framework for anticipating his likely leadership style as president, as outlined in this report of how Romney will govern, if elected.