Principal Investigators

John M. Colford, Jr., MD, PhD
Coordinating Principal Investigator
University of California, Berkeley

Jack Colford is Professor of Epidemiology in the School of Public Health at UC Berkeley. He trained at Johns Hopkins (MD); Stanford (Chief Medical Resident); UCSF (residency in Internal Medicine and fellowships in ID and HIV/AIDS); and UC Berkeley (Epi PhD). He has served as the Principal Investigator for numerous randomized field trials and observational studies evaluating the impact of water, sanitation, and hygiene interventions in India, Bolivia, Guatemala, Bangladesh, Kenya, Mexico, and the United States. He teaches courses each year at UC Berkeley on Epidemiologic Methods, the Design of Randomized Controlled Trials, and on Impact Evaluation for Health Professionals. He is an attending physician in Infectious Diseases at the UCSF/VA Medical Center in San Francisco.

Stephen P. Luby, MD
Principal Investigator, WASH Benefits Bangladesh
Medical Epidemiology
Professor of Medicine (Infectious Diseases & Geographic Medicine)
Director of Research, Center for Innovation in Global Health
Senior Fellow Woods Institute for the Environment
Senior Fellow Freeman Spogli Institute for International Studies
Stanford University

Steve Luby is a Professor of Medicine (Infectious Diseases & Geographical Medicine, Director of Research at the Center for Innovation in Global Health, and Senior Fellow at the Stanford Woods Institute of the Environment and the Freeman Spogli Institute for International Studies. Prior to this, Dr. Luby was Head of the Program on Infectious Diseases and Vaccine Sciences at the International Center for Diarrheal Disease Research, Bangladesh and functioned as the Head of Agency for the Centers for Disease Control in Bangladesh. He is a graduate of Creighton University, earned his medical degree from the University of Texas Southwestern Medical School at Dallas, and completed his internship and residency in internal medicine at the University of Rochester-Strong Memorial Hospital. Dr. Luby studied epidemiology and public health in the Epidemic Intelligence Service and the Preventive Medicine Residency of the U.C. Centers for Disease Control and Prevention. He has directed the epidemiology unit of the Community Health Sciences Department at the Aga Khan University in Karachi, and has worked as a Medical Epidemiologist at the CDC, Atlanta. His research has focused on the causes and prevention of diarrheal disease in settings where diarrhea is a leading cause of childhood death.

Michael Kremer, PhD
Co-Principal Investigator, Kenya
Innovations for Poverty Action

Michael Kremer is a Research Affiliate of Innovations for Poverty Action. He is the Gates Professor of Developing Societies in the Department of Economics at Harvard University and Senior Fellow at the Brookings Institution. He is a graduate of Harvard College and received his Ph.D in 1992 from Harvard University. He is a Fellow of the American Academy of Arts and Sciences, a recipient of a MacArthur Fellowship and a Presidential Faculty Fellowship, and was named a Young Global Leader by the World Economic Forum. Kremer's recent research examines education and health in developing countries, immigration, and globalization. He founded and was the first executive director of WorldTeach, a non-profit organization which places 360 volunteer teachers annually in developing countries.

Clair Null, PhD
Co-Principal Investigator, Kenya
Emory University and Innovations for Poverty Action

Clair Null is an Affiliate of Innovations for Poverty Action and a Researcher at Mathematica Policy Research.  Previously, she was an Assistant Professor of Global Health at Emory University's Rollins School of Public Health and a Fellow at Harvard University's Radcliffe Institute for Advanced Study. She holds a PhD in Agricultural and Resource Economics from the University of California at Berkeley and is a graduate of Smith College. In addition to leading the WASH Benefits study in Kenya, Dr. Null has served as a Principal Investigator for the Chlorine Dispenser System under IPA’s Safe Water Program in Kenya; the “SaniPath” Project in low income Accra, which is assessing fecal exposure pathways using environmental microbiology and behavioral research; and Mathematica Policy Research's independent evaluation of the Community-Based Health and Nutrition Project to Reduce Stunting in rural Indonesia funded by the Millennium Challenge Corporation.