Dr. Justin J. Lang is an epidemiologist specializing in population health at the Public Health Agency of Canada. He is also an adjunct Professor at the University of Ottawa. His research focuses on public health, physical fitness, and the ways in which physical activity influences mental health and interacts with the built environment. Dr. Lang's work aims to uncover how lifestyle factors, particularly physical activity, contribute to health and wellness across diverse populations. His insights are crucial for developing strategies that encourage healthier living environments and promote well-being through active lifestyles, directly impacting public health policies in Canada.