Dr. Liu is an Assistant Professor of Epidemiology at the Department of Public Health Sciences of the University of Rochester Medical Center. He has over ten years of experience conducting HIV prevention research among populations disproportionally affected by HIV in various settings, including sex and gender minority groups, injecting drug users, HIV-exposed infants, and commercial sex workers. His current research focuses on leveraging advanced quantitative/qualitative methods, behavioral theories, implementation science, and technology (e.g., data science and social media) to design/implement novel HIV prevention interventions to reduce HIV/STI risks and to enhance the adoption of proven HIV prevention strategies (e.g., HIV testing and HIV pre-exposure prophylaxis) among gay, bisexual, and other men who have sex with men (GBMSM) in the United States.