Dr. Song Zhang is a tenured professor of biostatistics from the Peter O’Donnell Jr. School of Public Health, UTSW. He serves as the director of BERD (Biostatistics, Epidemiology, and Research Design) for the CTSA program. He received his Ph.D. in statistics from the University of Missouri-Columbia. His research interest includes Bayesian hierarchical modeling and clinical trial design. He has co-authored two books titled "Sample Size Calculations for Clustered and Longitudinal Outcomes in Clinical Research" and "Design and Analysis of Pragmatic Trials", both published by Chapman & Hall/CRC. As the principal investigator, Dr. Zhang has received fundings from PCORI, NIH, and NSF to support his research.