Changing the Course of AIDS is an in-depth evaluation of a new and exciting way to create the kind of much-needed behavioral change that could affect the course of the global health crisis of HIV/AIDS. This case study from the South African HIV/AIDS epidemic demonstrates that regular workers serving as peer educators can be as – or even more – effective agents of behavioral change than experts who lecture about the facts and so-called appropriate health care behavior. After spending six years researching the response of large South African companies to the epidemic that is decimating their workforce as well as South African communities, David Dickinson describes the promise of this grassroots intervention – workers educating one another in the workplace and community – and the limitations of traditional top-down strategies.