He obtained his PhD in Statistics from the University of Chicago in 1998, and after seven years on the faculty in the Department of Biostatistics at Harvard School of Public Health, where he taught Statistics and Biostatistics at the undergraduate and graduate level, he joined UCSD in 2004. His research interests are in mixed-effects models, proportional hazards mixed-effects models, and model selection. Dr. Vaida has published over 80 papers in peer-reviewed journals, and he has extensive experience in the areas of HIV and NeuroAIDS. Among other projects, he is currently collaborating with the HIV NeuroBehavioral Research Center and the Translational Methamphetamine Research Center at UCSD.