Jack Colford, MD PhD is a Professor of Epidemiology at the UC Berkeley School of Public Health. Jack attended medical school at Johns Hopkins and then completed an Internal Medicine residency, a fellowship in Infectious Diseases and a separate NIH fellowship in HIV/AIDS at UC San Francisco before completing a PhD in Epidemiology at UC Berkeley. He served as the Chief Medical Resident at Stanford and has received clinical and classroom teaching awards at UC San Francisco, Stanford, and UC Berkeley. He was a Visiting Scientist in the Water and Sanitation group while on sabbatical at WHO Geneva. Jack has been the Principal Investigator for numerous large-scale, randomized field trials and observational studies evaluating the impact of water, sanitation, hygiene and nutrition interventions in India, Bolivia, Guatemala, Bangladesh, Kenya, Mexico, and the United States. He has co-authored more than 130 peer-reviewed publications. He is the coordinating PI of the WASH Benefits trials (washbenefits.net). His projects have been supported by the NIH through four separate R01 awards, separate R03 and R21 awards, multiple Gates Foundation awards, and funding from the CDC, the World Bank, and the USEPA. All of his work involves large teams of interdisciplinary investigators, including colleagues from Engineering, Public Policy, Economics, molecular biology and microbiology. Jack is the faculty director of the UC Berkeley Online MPH Program and teaches three online Epidemiology courses in addition to his regular campus courses on Epidemiologic Methods, Global Health, and the design of randomized clinical and impact evaluation trials. He has also taught Epidemiology during the summer in the MPH Program at the University of Zurich for the last 20 years.