Horacio Riojas Rodríguez, Ph.D., is a medical doctor at the National Autonomous University of Mexico (UNAM) 1983. He has a Master’s degree in Sciences in Environmental Health (1994–1997) and a Ph.D. degree in Epidemiology with honors from the National Institute of Public Health (INSP) (2005) in Mexico. Area of expertise in environmental health (environmental epidemiology and risk assessment). Has been working in this area for the last 28 years on different issues but especially on the effects of indoor and outdoor air pollution and climate change and health. Other projects and publications include exposure to persistent organic pollutants and metals. His experience in air pollution includes analyses of the effect of wood smoke on women and children and the effects of ambient air pollution in cities. More recently has been involved in health impact assessment studies in different cities in Mexico. The first one estimated annual avoidable deaths in Mexico City. Director of Environmental Health Department at the Center for Population Health Research at the National Institute of Public Health Mexico. Leader of the Research line with a mission on health and the environment. Founder and Academic Coordinator of the Environmental Health Sciences Ph.D. program at the Mexican Public Health School (INSP).