L. Joseph Su has a PhD in nutritional epidemiology at the University of North Carolina at Chapel Hill and M.P.H. in public health nutrition at the University of Minnesota, Minneapolis. He is now working as a professor of epidemiology and an associate dean for academic affairs at the Peter O'Donnell Jr. School of Public Health. Prior to that, he was a branch chief at the Division of Epidemiologic Research of the Center for Medical Devices and Radiological Health, and a Program Director at the Epidemiology and Genomic Research Program, Division of Cancer Control and Population Sciences, National Cancer Institute (NCI). He also serves as a member of American Association for Cancer Research. His research interests include biomarker analyses: carotenoids and tocopherols (HPLC), biomarker analyses: heavy metals (ICP-MS), cancer epidemiology, dietary assessment, environmental epidemiology, interdisciplinary aging research, nutritional epidemiology.