The history of how we understand leaders and leadership lessons may be found in the earliest records of warriors, generals, and kings. Leadership is also described in biblical and religious works as well as in the writings of Plato, Sun Tzu, Machiavelli, and Shakespeare. Leadership as an academic and practice discipline, however, began primarily in the twentieth century and primarily focuses on behavior in organizational and human social contexts. It is multidisciplinary and cross-cultural drawing from the social sciences and management studies, arts and humanities, and professional and applied domains including engineering, education, and healthcare/medicine.