This study focuses on the relationship between Emotional Intelligence (EI) and leadership. The main study is related to how EI influences leadership in both positive and negative ways. The study explores the definition of EI, and how EI influences leadership behaviors which includes how the four factors of EI affect Katz’ Three Skills. The study also discusses how EI affects leadership behaviors and outcomes positively and negatively. EI plays an important role in leadership, and the study explains that EI significantly facilitates leaders to be effective leaders if they are able to balance both positive and negative influences of EI. Most articles study the positive side of EI, though some articles explain the negative side of EI. However, an effective leader needs to obtain the abilities to balance both sides of EI in leadership. For further discussion in the future, a question to consider is how can leaders keep a suitable balance of these positive and negative aspects of EI in leadership?