The document summarizes the history and development of the Zero Suicide initiative in healthcare from its origins in the US Air Force initiative in the early 2000s. It traces the expansion of Zero Suicide efforts to include crisis call centers, health plans, clinical care frameworks, national strategies in countries like England, Wales, and the US, and international collaborations. The timeline shows how individual programs and whole countries have worked to implement Zero Suicide principles and reduce suicide rates in healthcare systems through coordinated efforts across various parts of the system.