Dr. S. Marshall Adams directs the Biological Indicators research program at Oak Ridge National Laboratory. He is responsible for designing, coordinating, and conducting large field studies to investigate the effects of environmental stressors, primarily contaminants, on freshwater and marine ecosystems. His primary research activity involves determining the integrated physiological and bioenergetic effects of environmental stressors on fish populations and communities and evaluating the ecological significance of these effects on the biotic integrity of stream, river, and reservoir systems. Many of his studies have used integrated bioindicators to determine the effects of environmental remediation activities on aquatic system health. He is currently Editor-in-Chief of the newly founded Journal of Aquatic Ecosystem Stress and Recovery.

Dr. Mark S. Greeley, Jr., is a comparative physiologist in the Environmental Sciences Division at Oak Ridge National Laboratory. He has research interests in the reproductive, endocrine and developmental biology, and toxicology of aquatic organisms. He has directed environmental assessment programs associated with the Department of Energy (DOE) and Department of Defense Superfund sites across the nation, and he is currently project manager for the Biological Monitoring and Abatement Program at the DOE Y-12 Plant in Oak Ridge, Tennessee. At Oak Ridge National Laboratory, Dr. Greeley also heads a diverse working group of scientists who are interested in the effects of endocrine-disrupting substances on human and ecological health. Current research projects include a long-term study of the effects of chronic, low-level exposure to environmental contaminants on the health and reproduction of fish in freshwater streams and lakes that are contaminated by industrial and municipal wastewater discharges.

Dr. Kai-Lin Lee is a molecular biologist involved in identifying the molecular mechanisms that regulate gene expression in mammalian cells during development and growth. His recent studies have focused on the analysis of genetic diversity in natural populations of fish and the effects of genotoxicants on DNA in fish.

Dr. Mark S. Bevelhimer is a fish ecologist in the Environmental Sciences Division at Oak Ridge National Laboratory. His research has involved bioenergetics modeling, thermal ecology, habitat selection, hydropower impacts, contaminant effects, and PCB transport and fate in aquatic systems. He has used his work on the effects of various environmental stressors on the bioenergetics and behavior of fish in both NEPA and CERCLA compliance projects. These projects include environmental impact statements, remedial investigations, and development of monitoring plans at sites throughout the country. Dr. Bevelhimer uses a variety of simulation modeling tools to address problems when experimental approaches are not feasible.

Dr. Rebecca A. Efroymson is an environmental toxicologist and ecological risk assessor in the Environmental Sciences Division at Oak Ridge National Laboratory. Her research experience includes development of frameworks, toxicity benchmarks and models for ecological risk assessment, with emphases on contaminated soils, air pollutants, plants, microorganisms, and soil invertebrates. She has led an ecological risk assessment for land application of sewage sludge in forests and arid ecosystems. She is developing an ecological risk assessment framework for military aircraft overflights (e.g., impacts of noise) and contributing to a broader risk assessment framework for military training and testing activities.

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