This case study analyzes Michael O'Leary's leadership style and business philosophy, focusing on his role as CEO of Ryanair. It examines his task-based leadership, emphasizing efficiency and shareholder returns, and his unique business philosophy of offering low-cost services. The analysis explores O'Leary's personality traits, including openness, conscientiousness, extraversion, agreeableness, and neuroticism, and how these traits influence his leadership. The study further investigates the impact of his leadership on Ryanair's organizational culture and employee motivation, supported by relevant theories. It also delves into O'Leary's decision-making process, including identifying issues, seeking information, choosing alternatives, implementing plans, and evaluating outcomes, and discusses the changes he implemented at Ryanair and potential resistance he might face. The conclusion summarizes the key findings, highlighting the impact of leadership and organizational behavior on company culture and workforce motivation, as well as the importance of effective decision-making processes for organizational development.