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John H. Seinfeld
Summary
John Hersh Seinfeld (born August 3, 1942) is an American chemical engineer and pioneering expert in atmospheric science. His research on air pollution has influenced public policy, and he developed the first mathematical model of air quality, which has influenced air pollution tracking and research across the United States. He has spent his career at the California Institute of Technology, where he is currently the Louis E. Nohl Professor of Chemical Engineering.
Seinfeld grew up in Elmira, New York, and attended the University of Rochester, where he earned a B.S. in chemical engineering in 1964. He then went to Princeton University, where he received a Ph.D. in chemical engineering in 1967. His doctoral dissertation, entitled "Optimal control of distributed-parameter systems," was concerned with the theory of control and optimization of distributed-parameter systems, which are systems governed by partial differential equations.
Seinfeld joined Caltech as an assistant professor of chemical engineering in 1967. He originally continued his research in control theory, but soon became intrigued by the elevated level of smog in Los Angeles and shifted his research to investigate air pollution. At the time, atmospheric research relied on approaches like Gaussian plume models, and Seinfeld realized that his mathematical expertise could be applied to understand the underlying chemistry of the reactions occurring in the air. He then formed a research group, which formulated a chemical mechanism for ozone formation. In 1973 they developed the first large-scale urban air pollution model, which was applied to the Los Angeles basin. This work, published in three papers in the journal Atmospheric Environment, initiated a new field of scientific research devoted to the modeling of tropospheric pollution. The model also became the precursor for air pollution modeling that is now used nationwide by the U.S. Environmental Protection Agency.
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