My research interest centers on the genetic and molecular epidemiology of common complex diseases, including cancer, obesity, type 2 diabetes, and cardiovascular diseases, as well as intermediate traits, including inflammation and metabolic measurements. Within well characterized and diverse study populations, we are studying the impact of common and rare genetic variants across the entire genome, as well as interactions between genetic variants and environmental factors (such as diet, exercise, smoking and aspirin use). We are increasingly bringing in functional genomic data to inform gene-environment interactions as well as rare variant testing. In addition, we are conducting a large-scale study to integrate the tumor and host genome to investigate associations of germline genetic, environmental risk factors and survival in relation to colorectal cancer subtypes defined by existing tumor characteristics as well as novel somatic mutations in colorectal cancer. A further interest of us is the translation of our findings into public health practice and clinical care. Accordingly, we have developed comprehensive risk prediction models that can personalize screening decisions.