Hayles was born in Saint Louis, Missouri to Edward and Thelma Bruns. She received her B.S. in Chemistry from the Rochester Institute of Technology in 1966, and her M.S. in Chemistry from the California Institute of Technology in 1969. She worked as a research chemist in 1966 at Xerox Corporation and as a chemical research consultant Beckman Instrument Company from 1968-1970. Hayles then switched fields and received her M.A. in English Literature from Michigan State University in 1970, and her Ph.D. in English Literature from the University of Rochester in 1977.
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