David Levy has a PhD in Economics from UCLA and is currently a Professor of Oncology at Georgetown University. He has published over 250 articles, including in the American Economic Review, BMJ, AJPH, JAMA, Lancet, Tobacco Control, and PLOS Medicine. He has been principal investigator of grants from the CDC, WHO, the National Cancer Institute, and Bloomberg/Gates Foundation.  Dr. Levy is currently overseeing the design and development of the SimSmoke tobacco policy simulation model, which he has developed models for over 40 countries covering 85% of the world population. He is now developing models of smokeless tobacco and e-cigarette use.