Marc Lipsitch is Professor of Epidemiology and Director of the Center for Communicable Disease Dynamics at the Harvard School of Public Health. He is an author of more than 200 peer-reviewed publications on antimicrobial resistance, mathematical modeling of infectious disease transmission, bacterial and human population genetics, and immunity to Streptococcus pneumoniae. His group produced one of the earliest estimates of transmissibility of the SARS virus in real time in 2003, and provided a key estimate of the transmissibility of 1918 pandemic influenza. Recent contributions include genomic epidemiology studies of E. coli O104:H4, drug-resistant gonococcus, and Streptococcus pneumoniae; a series of papers establishing the role of absolute humidity in the winter seasonality of influenza, epidemiologic and microbiological studies of pneumococcal serotypes and a computational model synthesizing immunologic and other effects on pneumococcal serotype diversity. A new research direction is to use disease transmission models to inform the design of clinical trials for vaccines, and to work at the interface between scientific methodology and research ethics. Dr. Lipsitch received several outstanding young investigator awards and in 2015 was elected a Fellow of the American Academy of Microbiology He is or was on the editorial advisory boards/associate editor of eLife, PLoS Medicine, Journal of Infectious Diseases, American Journal of Epidemiology, Epidemiology, and Epidemics. He has served on the President's Council of Advisors on Science and Technology Working Group on H1N1 Influenza, as well as CDC’s Team B for the 2009 H1N1 pandemic. He has provided advice on antimicrobial resistance, SARS and influenza to the Food and Drug Administration, World Health Organization, Centers for Disease Control, Congressional Budget Office, Defense Science Board, several pharmaceutical companies and the governments of Canada and Mexico.