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Louis J. Guillette, Jr. is Distinguished Professor of Zoology at the University of Florida and Professor of the Howard Hughes Medical Institute. Dr. Guillette received his doctorate in Comparative Reproductive Biology from the University of Colorado @ Boulder in 1981. Dr. Guillette is an award-winning teacher of Embryology and Reproductive Biology. He has been awarded the University of Florida's highest faculty awards - Teacher/Scholar of the Year in 1998 and Distinguished Alumni Professor in 1999. Internationally recognized for his work in the field of comparative reproductive biology and developmental endocrinology, he has advised such countries as New Zealand, Australia Mexico, South Africa and Botswana on the development of reproductive biology programs for endangered wildlife. Dr. Guillette also is recognized for his research examining environmental contaminants and reproductive/endocrine disruption in various wildlife species, and policy work in human public health. He has served as an expert witness to the US. Congress and as a science policy advisor to various governmental agencies regarding environmental contamination and health. His current work examines the effect of environmental pollutants on the genetic-endocrine signaling associated with the development and functioning of the genitalia and gonads of various vertebrate species.