He has over 25 years experience in design, implementation and analysis of large longitudinal studies, including clinical trials of HIV-positive and drug abusing populations as well as both individual and family-focused preventive and treatment interventions. He has been the statistician on numerous federally funded projects, including center grants, RO1s, cooperative agreements and multi-site trials. Dr. Feaster has expertise in multi-level (also known as hierarchical linear) modeling, structural equation modeling and extensive experience with longitudinal analysis and methods for handling missing data.