Charles N. Haas is the head of the department of Civil, Architectural and Environmental Engineering at Drexel University and the Betz Chair Professor of Environmental Engineering.  He has served on numerous advisory committees of the US EPA and the National Research Council Joan Rose serves as the Homer Nowlin Chair in Water Research at Michigan State University, the ... Read moreCo-Director of the Center for Advancing Microbial Risk Assessment (CAMRA) and the Director of the Center for Water Sciences (CWS).  She is a member of the National Academy of Engineering. Charles P. Gerba is a Professor in the department of Soil, Water and Environmental Science at the University of Arizona. He is the author of 11 books and over 400 journal papers. Dr. Gerba is a member of the U.S. Environmental Protection Agency's Science Advisory Board Committees on Drinking Water and Research Strategies. Show Less