This book discusses why many employees think of mergers or acquisitions as scary or threatening events, why negative emotions are prevalent, their psychobiological impact and how to assess employees’ emotional responses using a new toolkit. It helps readers learn what counts as good leadership, considering the role of charisma, personality, context and information processing abilities. This book includes the issue of organizational learning, and the relevance of occupational health and safety to due diligence about mergers and acquisitions through case studies about organizations sued for cancer or cancer-related mortality after a merger or acquisition. This book is mandatory reading for students, academics, and practitioners working with organizations experiencing a merger or an acquisition such as consultants, human resource professionals, psychologists, occupational health professionals, and employees involved in strategy, management, or people development.