Society for Descriptive Psychology

Joel Jeffrey majored in mathematics at the California Institute of Technology, and did his graduate work at the University of Colorado. He began studying Descriptive Psychology under Peter Ossorio in 1971, and received his Ph.D. in computer science in 1974. He wrote one of the first two industrial expert systems ever created, and discovered and patented a technique for applying judgment simulation vector spaces to large-scale problems. In 1999 he founded H5 Technologies, a software company based on the discovery, and served for three years as its Chief Scientist. He is a Professor of Computer Science at Northern Illinois University, where he pursues research in artificial intelligence, real world software engineering, and mathematical modeling of biological, social, and economic systems.