Thomas W. Valente, PhD, is Professor and Interim Chair in the Department of Preventive Medicine, Keck School of Medicine, at the University of Southern California. He is author of Social Networks and Health: Models, Methods, and Applications (2010, Oxford University Press); Evaluating Health Promotion Programs (2002, Oxford University Press); Network Models of the Diffusion of Innovations (1995, Hampton Press); and over 175 articles and chapters on social networks, behavior change, and program evaluation. Valente uses social network analysis, health communication, and mathematical models to implement and evaluate health promotion programs designed to prevent tobacco and substance abuse, unintended fertility, and STD/HIV infections. He is currently working on specification for analyzing network models of diffusion and contagion with the R package NetdiffuseR. Valente is also well-known for his work developing network models of program implementation and network interventions. Valente has received the Simmel Award from INSNA and the Rogers award from APHA. Valente has also received the USC Melon award for graduate student mentoring. Valente earned his BS in Mathematics from the University of Mary Washington, his MS in Mass Communication from San Diego State University, and his PhD from the Annenberg School for Communication at USC. From 1991 to 2000 he was at the Bloomberg School of Public Health; in 2008, he was a visiting senior scientist at NIH (NHGRI) for 6 months; and in 2010-2011 he was a visiting Professor at the École des Haute Études en Santé Publique (Paris/Rennes). Valente is co-editor (with Martin Everett) of Social Networks, and on the editorial boards of Network Science and the Journal of Health Communication.