Jonah Berger's Catalyst explores how to effectively drive change in individuals and groups.  Berger examines various psychological principles, such as reactance (resistance to persuasion), endowment (attachment to the status quo), and uncertainty aversion, illustrating how to overcome these barriers through techniques like asking questions, surfacing the costs of inaction, and reducing uncertainty. The book features numerous case studies, ranging from police negotiations to marketing campaigns and social movements,  demonstrating practical applications of these principles. Ultimately, Berger argues that anyone can be a catalyst for change by focusing on removing obstacles rather than solely pushing for a desired outcome.