Ryan Allen is an associate professor in the Faculty of Health Sciences at Simon Fraser University in Vancouver, Canada. He holds a Master’s degree in environmental engineering and a PhD in environmental health, both from the University of Washington in Seattle, USA. Following his doctoral training, Dr. Allen completed a post-doctoral fellowship in environmental epidemiology focused on the link between long-term air pollution exposure and the progression of subclinical cardiovascular disease. Dr. Allen’s research program is focused on air pollution exposure assessment methods, the evaluation of interventions to reduce air pollution exposures and health effects, and the impacts of early-life air pollution exposure on human growth and development. He has been working in Mongolia since 2010 in close collaboration with colleagues at the Mongolian National University of Medical Sciences. Since 2014, Dr. Allen has co-led the Ulaanbaatar Gestation and Air Pollution Research (UGAAR) study, a randomized controlled trial of portable air cleaner use during pregnancy, fetal growth, and childhood development.