Dr. Hayashi’s primary research interests and expertise include epidemiology, community-based research, public health and human rights, substance use, and health services for drug-using populations. She currently leads the Vancouver Injection Drug Users Study (VIDUS), a U.S. NIH-funded prospective cohort study of more than 1000 people who inject drugs in Vancouver, which aims to investigate the natural history of injection drug use. She also has extensive international research experience. Since 2008, she has led the Mitsampan Community Research Project, a serial cross-sectional mixed-methods study to investigate drug-using behavior, healthcare access and other drug-related harm among people who inject drugs in Bangkok, Thailand.