Chensheng (Alex) Lu, Ph.D. is an assistant professor of environmental exposure biology at the Harvard School of Public Health, Department of Environmental Health. Dr. Lu’s interests focus on the assessment of pesticide exposure resulting from indoor applications, agricultural spray drift, parental occupation, or from dietary intake. His research projects have included using saliva samples as an alternative for biological monitoring, using GPS to assess children's time-and-location in relation to their pesticide exposure, and assessing urban/suburban children's long-term exposure to pesticides. He co-authored, "Organic Diets Significantly Lower Children’s Dietary Exposure to Organophosphorus Pesticides."