Replacement examines the impact of artificial intelligence on employment, organizations, and individual economic security. Drawing on Nicolas Chaillan’s experience in software, cybersecurity, government technology, and generative AI, the book argues that AI-driven automation is already replacing significant categories of knowledge work rather than representing only a future possibility. It explores how AI agents can perform tasks previously assigned to teams of human workers, the economic incentives encouraging rapid adoption, and the risks faced by employees whose roles can be automated. The author also considers how individuals, families, and organizations can respond through reskilling, adaptation, entrepreneurship, and more deliberate use of AI tools. Written for professionals, business leaders, technology workers, and general readers concerned about the future of work, the book combines technological analysis with practical guidance for navigating employment disruption and changing labor markets