This paper aims to identify the impacts of emotional intelligence on leadership effectiveness. First, different approaches to leadership are shown and analyzed and narrowed down to a working definition of leadership. This definition is furthermore translated into categories of leadership categories as a first step to measure effective leadership. The categories are then filled with items from various leadership and management definitions in order to find an itemization of leadership. Itemizations used by previous academics, such as Stogdill's Leadership Behaviour Description Questionnaire (LBDQ) and Bass and Avolio's Multifactor Leadership Questionnaire (MLQ) are presented and analysed. The latter is then decided to be the most promising one for valid leadership research. In the second part, emotional intelligence is introduced and the capabilities of emotional intelligent persons are shown. It is then analysed if the defined characteristics of effective leaders would be enhanced by emotional intelligence, which is confirmed by this secondary research as well as by different primary researches. Recommendations for further research are given.