Dr. Cepeda’s research focuses on characterizing the intersecting epidemics of substance use, infectious disease, and justice involvement. His primary research interests involve 1) understanding how structural factors, such as prohibitionist drug policy, impact risk of fatal and non-fatal overdose, HIV and hepatitis C virus transmission; 2) evaluating the facilitators and barriers of accessing harm reduction and treatment services among people who inject drugs and 3) evaluating the trajectories of substance use, infectious disease, and comorbidities among people who inject drugs. His current work involves application of methods drawn from epidemiology, prevention science, mathematical modeling, and economic evaluation.