Paul received a bachelor's degree in dairy science in 1963 and master's in physiology of reproduction in 1965, both from the University of Illinois. He received his doctoral degree in physiology of reproduction from Purdue University in 1969. He served four years as a Captain in the U. S. Air Force as a Staff Research Physiologist at the U. S. Air Force School of Aerospace Medicine, Brooks AFB, Texas. He was a Postdoctoral Research Fellow in Neuroendocrinology at the University of Texas Southwestern Medical School in Dallas, Texas before joining the faculty at Texas A&M University in 1974.

Paul teaches both undergraduate and graduate courses in physiology of reproduction with a focus on reproductive biotechnologies. His graduate course is being taught as a Web-based distance course. He also teaches a course on the lactation of domestic animals.

Paul’s research involves enhancing the reproductive efficiency of domestic animals by understanding the neural control of ovarian function. His early effort contributed to the understanding of the pulsatile nature of gonadotropin secretion in mammals. More recent work has focused on the cellular mechanisms and factors affecting (i.e. body condition) the secretion of the gonadotropin releasing-hormone.

Paul’s recognitions include the Faculty Distinguished Achievement Award in Teaching from The Association of Former Students of Texas A&M University. He received a TAMU College of Agriculture and Life Sciences Vice Chancellor's Award In Excellence for Team Research. He has been recognized for his service to numerous professional societies including President of the Southern Section of the American Society of Animal Science.

Paul’s society memberships include the American Association for the Advancement of Science, American Scientific Affiliation, American Society of Animal Science, Society for the Study of Reproduction (Charter Member), Society for the Study of Fertility, The American Physiological Society, and The Endocrine Society.