The case study analyzed the organizational changes and leadership styles before and after a merger. The 7-S Model, PESTLE Analysis, and SWOT Analysis were used to identify internal and external factors affecting the organization's operations. Leadership theories such as Transactional, Transformational, Behavioural, Contingency, Trait, and Great Man Theory were reviewed to understand their impact on strategic outcomes and sustainability. Personality traits of managers were assessed using the O.C.E.A.N Big Five Personality Model. The data collection process involved gathering information from the company about its performance before and after the merger. Data analysis methods included secondary research analysis and case analysis to determine the strategic decision-making process of managers and leadership quality of the new CEO.