Carl A. Latkin holds a B.Sc. from Wesleyan University, an M.Sc., and a Ph.D. from the University of Oregon. He is now a Professor at the Department of Health, Behavior, and Society, Johns Hopkins University. His work focuses on HIV prevention and care among disadvantaged populations, domestic and international approaches to behavior change, social network analysis, neighborhood factors, and health behaviors, sexual minorities, people who inject drugs, harm reduction, mental health, social context, integrating qualitative and quantitative methods, vaccine hesitancy, COVID-19, overdose, heroin, fentanyl, climate change, and climate change action.