Dr. Chattopadhyay has more than 25 years of experience as a chemical engineer and energy/environmental consultant in project/program management; technology transfer and support; application of corrective action strategies; remediation and innovative clean up technology design and implementation; quality assurance; site investigation and remediation of soil, sediment and water; water and wastewater treatment; energy audit; carbon management and optimization for power plants and process industries; risk assessment; water and building infrastructure protection and security; and identification, quantification and decontamination of chemical, biological and radiological materials in water distribution systems, air, soil and other matrices. Dr. Chattopadhyay is Tetra Tech’s National Program Manager for U.S. EPA’s STREAMS; Testing and Evaluation of Homeland Security; and Test and Evaluation (T&E) facilities contracts. Dr. Chattopadhyay has hands-on experience in engineering installation, commissioning, and trouble-shooting of water and wastewater treatment and product recoveries for power plants, fertilizers, and refineries. Dr. Chattopadhyay participated as an expert panel member and made presentations at Water Security Workshops, and meetings organized by the U.S. Environmental Protection Agency (U.S. EPA), Department of Defense (DoD) including ESTCP/SERDP, Department of Energy (DoE) and other Agencies. He has provided support to U.S. EPA, Coast Guard, Navy, Army, White House, and United Nations on various projects related to contaminated sediment remediation, green and sustainable remediation, water infrastructure, climate change and carbon management. Dr. Chattopadhyay is the lead inventor and patent holder of two “green, environmentally friendly” materials to capture multiple contaminants from watershed, air, soil and sediment systems. Another decontamination technology is being processed for patent application. Dr. Chattopadhyay is in editorial board of two peer-reviewed environmental journals: Advances in Environmental Research (Techno Press) and Water Quality, Exposure and Health (Springer). He is also the co-author of EPA model “Virulo,” which is a probabilistic screening model that employs Monte Carlo methods to generate ensemble simulations and generates a probability of failure to achieve a user-chosen degree of attenuation.