His primary research interest has been in the development of statistical methods for environmental and genetic epidemiology, with numerous collaborations in both areas. On the environmental side, he has been particularly active in radiation carcinogenesis and air pollution health effects research, notably as one of the senior investigators on the Southern California Children’s Health Study and the Women’s Environmental Cancer and Radiation Exposure (WECARE) study and as a member of President Clinton’s Advisory Committee on Human Radiation Experiments. On the genetic side, he is a coinvestigator in the NCI’s Colon Cancer Family Registry, the Genetic Analysis Workshop, the ENDGAME consortium to develop methods for genome-wide association studies, and past President of the International Genetic Epidemiology Society. Dr. Thomas has numerous publications, including the textbooks Statistical Methods in Genetic Epidemiology (Oxford University Press, 2004) and Statistical Methods in Environmental Epidemiology (Oxford University Press, 2009). He currently directs a program project grant on “Statistical methods for integrative genomics in cancer.”