Introduction The study of leadership and personality is a well-traversed path. There are various researches on the personality traits of leaders (van Eeden, Cilliers, & van Deventer, 2008; Aronson, 2001). But most studies have concentrated on assessing leadership personality through quantitative research. A qualitative method of study in personality study has been limited. This paper aims to do a leadership personality study using the case study method. The personality whom we aim to study is Carlos Slim, the richest man in the world according to Forbes magazine (Winter, 2007, p. 35). The study will try to ascertain different aspects of Slim’s personality vis-à-vis the leadership personality theory. In this paper, we will try to establish a relationship between Slim’s behavior and their outcomes. The following section will undertake a brief study of the theoretical background of leadership personality. Slim’s Background This is a true story of rags to riches – Carlos Slim had transformed himself and his company into a $59 billion empire (Winter, 2007, p. 35). To provide a brief background, Slim is a Mexican business tycoon who is a self-made man. He owns the Mexican telecom giant Teléfonos de México or Telmex. There are various controversies regarding Slim’s monopolistic growth and corrupt handling of political alliances (Winter, 2007, pp. 36-37). But the fact remains that he is presently the richest man in the world and an excellent leader who had transformed his company into an empire that has spread from “cigarettes to airlines” (Winter, 2007, p. 35). Presently he has put in a lot of money into philanthropic activities which drive away his reputation of being a capitalist competition killer. This paper tries to ascertain the leadership traits of Slim with the help of leadership theories and researches. Theoretical Background The leadership characters and their personality traits are different for all individuals and cannot be generalized (Goffee & Jones, 2006, p. 31). But still, we encounter personality trait theories like Big Five Personality Theory or leadership theories like Transactional and Transformational Leadership. The Big Five Theory of personality asserts that there are five basic personality traits which in combination provides a personality type. The personality traits are neuroticism, extraversion, openness to experience, conscientiousness, and agreeableness. Neuroticism implies an individual’s ability to adjust and his emotional stability. So a person with a high degree of neuroticism will suffer from depression, anxiety, hostility, etc. Extraversion implies an individual’s assertiveness. Openness to experience shows a person’s intellectually curious mind and his desire to seek new ideas. Agreeableness shows a person’s interpersonal skills. Conscientiousness implies the level to which an individual is organized, hard-working, and motivated. For leaders, it is believed that the level of neuroticism, openness to experience, agreeableness, and conscientiousness is high (Zhao & Seibert, 2006, p. 265). But their degree of extraversion may or may not be low (Zhao & Seibert, 2006, p. 266). Taking this research study to be our benchmark, we try to ascertain from a qua