In todays business world a high IQ is no longer a prerequisite for long-term success. In recent years the importance of emotions in workplace has grown immensely. The construct of emotional intelligence receives pivotal priority in leadership, because emotions often play a greater role than logical and factual processes. Therefore, the goal of this master thesis is to explore the relationship between emotional intelligence and leadership based on recent research results to emphasise the positive consequences of the various findings for the leadership process. Based on the different terms that describe the construct of emotional intelligence, current theoretical models of the concept are described and analysed. Furthermore, the measuring methodologies of emotional intelligence illuminated by self-report instruments and tests, which are measuring maximum performance, are critically examined. The following chapter focusses on leadership which is the core of this master thesis. The chapter deals with various causes of leadership changes and as well as the aspect of what roles the leader takes in change processes. Based on these findings, the importance of emotions in companies is discussed and the term of emotional leadership is introduced. After the theoretical review, several empirical studies of emotional intelligence and leadership will be described. Based on these empirical studies, positive consequences regarding the use of emotional intelligence in the leadership processes will be discussed. In the end, the results relating to the inaccurate specification of the construct will be critically questioned. Finally, a brief analysis the new requirements of executives closes the thesis.