Dr. Marshall is founding director of the People, Place & Health Collective (PPHC) at Brown University. He received a Ph.D. in epidemiology from the School of Population and Public Health at the University of British Columbia. During doctoral training, he worked at the British Columbia Centre for Excellence in HIV/AIDS. In 2011, Marshall completed postdoctoral training at the Columbia University Mailman School of Public Health.
Broadly, Dr. Marshall's work focuses on substance use epidemiology, harm reduction research, and the social, environmental, and structural determinants of health of drug-using populations. He also examines the causes and consequences of drug and alcohol use, including overdose, HIV/AIDS, and hepatitis C virus infection. He is an expert in structural determinants of health; agent-based modeling; evaluation of harm reduction programs; and psychiatric and substance use epidemiology.