Dr. Teresa To has developed a population-based research program that focuses on childhood asthma. Using paediatric health databases, she examines factors that influence the health of children with asthma and their health outcomes. Her current asthma care research program spans from the acute, primary care settings, to the population levels.

To also maintains a cross-appointment at ICES (formerly the Institute for Clinical Evaluative Sciences) that allows her to use administrative databases to study health-care utilization, access to care, and practice patterns for a variety of medical and surgical conditions.