Daniel J. Feaster is a tenured Professor of Biostatistics within the Department of Public Health Sciences at the University of Miami Miller School of Medicine with over 30 years of experience in design, implementation, and analysis of substance abuse and HIV-related studies. He is or has been the statistician on over 30 federally funded projects, including center grants, R01s, cooperative agreements, and multi-site clinical trials. His areas of expertise include multi-level (also known as hierarchical linear) modeling, structural equation modeling, and longitudinal analysis and methods for handling missing data. Currently, he serves as an MPI and the biostatistician for the Florida Node of NIDA's Clinical Trials Network, which is in its 24th year of existence. In addition, he is a Co-director of the recently re-funded HIV and Mental Health Center (CHARM). His recent methodological research has focused on the use of finite mixtures and machine-learning techniques to explore heterogeneity of treatment effects.