This report looks into leadership theories. The report starts by looking into two major leadership theories, contingency theory and ‘great man’ theory. The report analyzes the differences between the two theoreies and explores how they help in building an understanding about leadership. The report then looks at two great leaders in the history of the world and the leadership styles together with the leadership theory that support their leadership styles. The report looks at the contingency theory of leadership in the light of leadership style of Nelson Mandela. It also looks into the tenets of contingency theory as they fit into the leadership style of Mother Teresa.