Christopher D. Knightes, Ph.D. Research Environmental Engineer (GS-15) at United States Environmental Protection Agency, Office of Research and Development, Center for Environmental Measurement & Modeling, Atlantic Coastal Environmental Sciences Division. Research interests include contaminant fate and transport modeling of aquatic ecosystems and watersheds with particular focus on processes, numerical mechanistic modeling, mercury, nutrients, eutrophication, emerging contaminants, nanomaterials. Member of iEMSs (International Environmental Modelling & Software Society, board member, outreach committee chair), Member of AGU (American Geophysical Union). Member of NEERS (New England Estuarine Research Society). Awards include US EPA Gold Medal for "Analysis of the Transport and Fate of Metals Released from the Gold King Mine in the Animas and San Juan Rivers," US EPA Gold Medal for Hydraulic Fracturing for Oil and Gas: Impacts from the Hydraulic Fracturing Water Cycle on Drinking Water Resources in the United States, and US EPA Silver Medal for "Development and application for mercury contaminated Nyanza Superfund Site (Sudbury River, MA)"