This report provides a comprehensive analysis of leadership and management within the service industry, focusing on the context of Marriott International. It begins by assessing classical management theories, including scientific, bureaucratic, and administrative approaches, and applies them to a service industry setting. The report then explores different leadership styles, such as democratic, autocratic, transformational, and transactional, and evaluates their relevance. It reviews the management and leadership styles of Marriott International, identifying internal and external factors that influence management styles and organizational structures. The report further assesses the current and future "hard" and "soft" skills required in the hospitality sector and compares change management systems and leadership approaches across various service industry organizations. The conclusion summarizes key findings and highlights the implications for effective leadership and management in the service sector.