TAPAS K. DAS, PhD, P.E., BCEE, is a fellow member of the American Institute of Engineers; past chair of the AIChE's Environmental Division; and former chair of the Air Pollution Control Committee of the American Academy of Environmental Engineers. Dr. Das also served as an adjunct faculty member at several colleges and universities in Washington, and taught both undergraduate and graduate courses in environmental, civil, chemical, and mechanical engineering programs, and was a former assistant professor in the College of Natural Resources at the University of Wisconsin, Stevens Point.