M. Claire Greene, PhD, MPH, is a psychiatric and substance use epidemiologist in the Program on Forced Migration and Health at the Columbia University Mailman School of Public Health. Her research focuses on improving the population-level impact of mental health and substance use programs in humanitarian settings by integrating methods in epidemiology, intervention evaluation, implementation science, and systems science. She is involved in research to evaluate and scale up mental health and substance use interventions among displaced populations in Latin America and Sub-Saharan Africa. In her work she collaborates with governmental and non-governmental organizations, multilateral agencies, and academic institutions. She completed a postdoctoral fellowship in global mental health implementation science at Columbia University/New York State Psychiatric Institute, received her PhD from Johns Hopkins Bloomberg School of Public Health, and her MPH from Yale School of Public Health.