engineering, University of Florida (1966–1970); associate professor of water chemistry (1970–1976), professor of environmental science (1976–1981), and professor of environmental engineering, University of Minnesota since 1981; and director, Water Resources Research Center since 1985. His research interests are the eutrophication of lakes, nitrogen dynamics in natural water, acid rain, and organic matter in water.

STEPHEN R. CARPENTER received his Ph.D. in botany (1979) from the University of Wisconsin, Madison. He served from 1979 to 1989 on the faculty at the University of Notre Dame, where he taught courses in biostatistics and aquatic ecology and developed limnological research programs at the Environmental Research Center near Land O' Lakes, Wisconsin. Dr. Carpenter has been Bassett Research Professor at the Center for Limnology, University of Wisconsin, Madison, since 1989. His research interests include ecosystem experiments, ecological modeling, plankton, and macrophytes. He has served on several committees and editorial boards for the Ecological Society of America and the American Society of Limnology and Oceanography.

G. DENNIS COOKE received his B.S. in biology (1959) from Kent State University, and his M.S. (1963) and Ph.D. (1965) in zoology from the University of Iowa. He has been involved in basic and applied research in zoology since the late 1960s, has served as a consultant to the U.S. Environmental Protection Agency's Clean Lakes Program, was one of the originators and the first president (1980-1981) of the North American Lake Management Society, and is associate editor of both the Water Resources Bulletin and Lake and Reservoir Management . Dr. Cooke has been a professor of biological sciences at Kent State University since 1976.

DONALD L. HEY received a B.S. in civil engineering (1963) from the University of Missouri at Rolla, an M.S. in water resources engineering (1968) from Kansas University, and a Ph.D. in environmental engineering (1974) from Northwestern University. He is currently director of Wetlands Research, Inc., in Chicago, Illinois, and president of Hey and Associates, Inc., in Chicago. A few of his past positions include adjunct professor, Northeastern Illinois University, Chicago; vice president, Hydrocomp, Inc., Palo Alto, California and Chicago, Illinois; and research analyst and engineer, Public Works Department, City of Chicago. His research interests include producing criteria necessary for restoring river systems through the use of



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