Biostatistics

Biography
Tyler Hartwell, Ph.D., a statistician, has been with RTI since 1964. He has extensive experience in designing large-scale clinical and behavioral trials, epidemiological multisite studies, and environmental exposure studies. Dr. Hartwell’s research areas include clinical and behavioral trials, international multisite trials, delivery and evaluation of community and worksite health intervention programs, and environmental issues. He has published widely on a variety of topics. He has been the principal or co-principal investigator on numerous large-scale studies and has managed a large group of statisticians. Read More…

Biography
Diane K. Wagener, PhD, has over 27 years of experience in academic and governmental institutions. She is the program manager of the Genomics and Statistical Genetics Program at RTI with expertise in designing and conducting epidemiologic studies and population-based surveys and analyzing data from a broad range of national data systems. These studies have involved the assessment of biological, behavioral, and environmental factors. Before joining RTI, she was the U.S. Department of Health and Human Services principal statistical advisor for the national health promotion and disease prevention initiative Healthy People. As director of the Division of Health Promotion Statistics at CDC and later in the Office of Public Health and Science of the Assistant Secretary of Health, Dr. Wagener coordinated the analyses of data from over 200 data systems to monitor national and state progress, inform policy decisions, and identify national data needs. Read More…

Biography
Dennis Wallace, PhD, joined RTI from Rho Federal Systems Division, Inc., where he was the principal investigator for statistical and clinical coordinating centers supporting research in infectious and autoimmune diseases. He specializes in the design and operation of clinical trials and the analysis of clinical trial data as well as data from environmental, epidemiological, and basic sciences studies. Dr. Wallace has provided statistical support and statistical leadership for clinical trials and epidemiologic studies of cardiovascular disease and stroke, clinical immunology, infectious diseases, substance abuse, developmental disabilities, geriatric medicine, sickle cell, and injury prevention. He has expertise in longitudinal and correlated data analysis and in linear and generalized linear models, with particular expertise in linear mixed models and the generalized estimating equation and nonlinear mixed model extensions of generalized linear models. He also has expertise in clinical trial design with emphasis on complex power calculations and on the design of cluster-randomized trials. Read More…