The big man has a big mouth: Mouth width correlates with perceived leadership ability and actual leadership performance

Previous studies have found that facial appearance can predict both the selection and performance of leaders. Little is known about the specific facial features responsible for this relationship, however. One possible feature is mouth width, which correlates with the propensity for physical combat in primates and could therefore be linked to one's perceived dominance and achievement of greater social rank. Here, we found that mouth width correlated with leader selection in experimentally standardized (Study 1A) and experimentally manipulated (Study 1B) faces. Applying these findings to real leaders, we observed that mouth width correlated with judgments of CEOs' leadership ability and with a measure of their actual leadership success (i.e., the profitability of their companies; Study 2). Individuals with wider mouths were also more likely to have won U.S. senate, but not gubernatorial, races (Study 3). Mouth width may therefore be a valid cue to leadership selection and success.