Historically notable leaders such as John F. Kennedy Mohandas Ghandi and Rupert Murdoch serve as exemplars in our field of study. Across the domains of military business government ideology and the arts these outstanding leaders havemarkedly impacted the institutions fields and broader social structures in which they worked and lived. To understand the unique styles developmental experiences and performance contributions of such leaders a historiometric approach is encouraged.We define thismethodological strategy as the study ofmultiple eminent leaders that requires the translation of historical qualitative information into quantitative indices of individual differences in leaders. Best practices limitations and implications for this technique as an advancement of leadership theory are reviewed.