Genomic Variation, Population Genomics and Disease Genomics of Disease Improvement of methods, approaches and tools for genome-wide association studies or polygenic risk assessments of complex traits. Includes approaches that address confounders or effect modifiers, and approaches to analyze ancestrally diverse populations. Rongling Li, M.D., Ph.D., M.P.H. Alexander Arguello, Ph.D. GWAS, genome-wide association, genetic epidemiology, statistical genetics, polygenic risk, PRS, gene-environment interaction, admixture mapping, population diversity, complex trait modeling