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to assistant professor in 1952, associate professor in 1957, he became the Chairman of the Division of Biological Sciences in 1974 and the Chairman of Zoology in 1978. In 1988 he was appointed the Clark Hubbs Regents Professor in Zoology and in 1991 gained emeritus status. In all, he spent 59 years working at the University of Texas and the university awarded him its Lifetime Service award. He was also a visiting professor of zoology at the University of Oklahoma and at Texas A&M University.

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