Founded in 1970, Population Services International (PSI) is a nonprofit organization based in Washington, DC that harnesses the vitality of the private sector to address the health problems of low-income and vulnerable populations in more than 65 developing countries around the world, principally through social marketing of health products and services and through behavior change communications campaigns. With programs in malaria, reproductive health, child survival, HIV and tuberculosis, PSI promotes products, services and healthy behavior that enable low-income and vulnerable people to lead healthier lives. Working in partnership with the public and private sectors, PSI’s core values include:.