This introduction presents an overview of the key concepts discussed in the subsequent chapters of this book. The book explores the influence of the informal leader on team member engagement during major change initiatives in the organizational paradigm, with a special emphasis on leaders who are new to the team composite. It examines the role of the informal leader in promoting or hindering employee engagement, team interactions, and OCBs in change dynamics with a focus on change related to major initiatives and leadership transition. The book also explores the relationship between the formal leader and the informal leader to assess the relational impact on a formal leader’s capacity to execute leadership decisions as well as the relational influence on citizenship behaviors during change. It provides a limited interview protocol was facilitated with a small but diverse group of formal leaders who exhibited traits of an empowered leaders to assess how they managed their teams.