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John I. Yellot was best known for his work related to solar energy. He was a promoter and scientist who advocated solar buildings, and he developed glass and plastic coatings for solar panels. He taught engineering at the University of Rochester, the Stevens Institute of Technology, and the Illinois Institute of Technology. He was a consultant to the metallurgical laboratory of the Manhattan Project. From 1942-1945, he was director of the Institute of Gas Technology during which time he was involved with gas-turbine locomotive development, and from 1945-1955, he was director of bituminous coal research for the Federal Government. In 1956, he moved to Arizona where he became director of the Association for Applied Solar Energy and director of Solar Energy Activities at Stanford Research Institute. He founded the "Journal of Solar Energy" and "The Sun at Work." In 1958, he created Yellot Solar Energy Laboratory. In 1966, he became p rofessor of architecture at Arizona State University. He retired Emeritus in 1985 and was awarded an honorary doctorate in 1986. He died in 1986.