Prior to coming GWUMC, he was an assistant professor in the Department of Medicine, Feinberg School of Medicine, and a member of Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, IL. He also served as a Senior Scientist at the NorthShore University HealthSystem Research Institute (previously Evanston Northwestern Healthcare Research Institute), Evanston, IL, and was associated with the Biological Sciences Division, Pritzker School of Medicine, University of Chicago, Chicago, IL.