Dan Crouse, a health geographer and environmental epidemiologist, recently joined HEI as a consulting senior scientist. Crouse specializes in novel methods of exposure assessment and describing environmental determinants of health. He has played a major role in studies on the characteristics of built environments (e.g., air pollution, greenness, walkability indices) and their potential effects on mortality, adverse birth outcomes, and incidence of cancer. He holds a Ph.D in health geography from McGill University in Montreal, Quebec, and a master’s degree in environmental studies from the University of Waterloo, Ontario. After earning his Ph.D, he spent five years as an epidemiologist at Health Canada, where he led the first Canadian national-level, population-based cohort study to investigate the risks of mortality associated with long-term exposure to ambient air pollution. Prior to joining HEI he was a research associate at the University of New Brunswick in Fredericton.