active membranes, and sediment capping. He received a B.S. in chemical engineering from MIT, an M.S. in chemical engineering from Yale, and a Ph.D. in environmental engineering from the Johns Hopkins University.

BARBARA D. BECK is a principal at Gradient. She is an expert in toxicology and in human health risk assessment for environmental chemicals, especially metals and air pollutants. Dr. Beck directs Gradient’s toxicology and risk assessment practice and has performed numerous site-specific and chemical-specific risk assessments, as well having developed exposure and risk assessment methodologies. She is a Diplomate of the American Board of Toxicology and a Fellow and past President of the Academy of Toxicological Sciences. Dr. Beck is also a Visiting Scientist in the Molecular and Integrative Physiological Sciences Program in the Department of Environmental Health at the Harvard School of Public Health. She has previously held the position of Chief of the Air Toxics Staff for U.S. EPA Region I. Dr. Beck received her A.B. in biology from Bryn Mawr College and Ph.D. in molecular biology and microbiology from Tufts University.

YU-PING CHIN is a Professor in the School of Earth Sciences at The Ohio State University. Prior to joining The Ohio State University, Dr. Chin conducted research at the Ralph M. Parsons Laboratory at the Massachusetts Institute of Technology on the properties of organic humic materials in marine and lacustrine porewaters and on the fluxes of particle reactive contaminants across the sediment/water interface. He is a specialist in natural attenuation, redox processes, and surfactant and cosolvent behavior in the subsurface. He is a current member of the Water Science and Technology Board. Dr. Chin received his A.B in geology from Columbia University and his M.S. and Ph.D. in aquatic chemistry from the University of Michigan.

ZAID CHOWDHURY is a vice president of Malcolm Pirnie, Inc., in Phoenix, Arizona. He has an extensive background in water treatment processes and is involved in all advanced drinking water process evaluations performed by the company. Dr. Chowdhury has managed many high profile projects including the development of the water treatment plant simulation model which he also incorporated into the Surface Water Analytical Tool (SWAT) for the regulatory development of the D/DBP Rule by the EPA. During his tenure at Malcolm Pirnie, he has managed numerous water quality evaluations involving bench- and pilot-scale studies for alternative treatment processes and the development of information needs for capital improvement programs for water utilities. He received his B.S. in civil engineering from the Bangladesh University of Engineering & Technology and his M.S. and Ph.D. in civil engineering from the University of Arizona.

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