The leadership style and the thereof oriented behavior pattern represents the basic attitude in which a person exercises its leadership tasks. There are a series of different leadership styles with numerous explanation attempts aiming to present a model for a successful leadership behavior. The worldwide trend leads in the direction of Management by Delegation with clear operating principles which is nowadays the central point of all general interests concerning this topic but a thorough documentation regarding the different leadership styles is the starting point for each manager when trying to build a good relation with the employees. A well-defined and applied leadership style will influence the working behavior of the employees and in turns lead to a better functioning of the whole organization. The knowledge-based organization needs to be up to date with both the oldest and the newest theories concerning leadership so it can create a working relationship with its employees. The present paper aims to present the main aspects concerning leadership, leadership styles and concepts in order to find the best way of creating a successful relationship between leadership and employees by strengthening the individual responsibility of each employee and hence improving the functioning of an organization.