David Senn is a Senior Scientist at SFEI, Co-Director of SFEI’s Clean Water program, and Lead Scientist for the San Francisco Bay Nutrient Management Program. He received his PhD in civil and environmental engineering from MIT, where he studied the interactions between nitrogen pollution and iron and arsenic cycling in contaminated urban lakes. Subsequently, as a researcher at the Harvard School of Public Health, he conducted contaminant fate, transport, and exposure studies, including investigating mercury cycling, bioaccumulation, and human exposure in the Gulf of Mexico. From 2007-2011, he worked at the Swiss Federal Institute of Technology (ETH) and the Swiss Federal Institute of Aquatic Science and Technology (Eawag), studying the ecological impacts of large dams in the Zambezi River Basin in southern Africa.