This report provides a detailed analysis of leadership and management theories, styles, and their influence on workplace culture, focusing on the Hays organization as a case study. It examines behavioral and contingency leadership theories, as well as scientific and human relations management theories, highlighting their benefits and drawbacks. Different leadership styles, such as authoritative and democratic, are compared based on their impact on decision-making. The report also identifies factors that influence cultural development in the workplace, including top leadership principles, the nature of the business, recruitment practices, and cultural diversity. It evaluates the significance of workplace culture on organizational performance, emphasizing how a positive culture can enhance performance while a dysfunctional culture can hinder success. The analysis emphasizes the importance of aligning leadership and management approaches with organizational goals to foster a productive and effective work environment.