Yvonne Thompson Greichus ’49, July 7, 1994, in Carson City, Nevada. After graduating from ºìÌÒÊÓƵ, she earned an MS in zoology and a PhD in biochemistry from the University of Wyoming, Laramie. She joined the faculty of South Dakota State University and reached the rank of full professor. In addition to teaching, she headed a pesticides research lab at the University. She and her husband, Algirdas Greichus, spent several years in South Africa doing research and lecturing at the University of Transkei. While in Africa, she completed a comprehensive study on the concentrations and movement of insecticides and other toxic chemicals in freshwater lake ecosystems. She received several grants during her career to study pesticides in aquatic ecosystems. She was the author of numerous scientific articles and research papers in national journals and was listed in the World Who's Who for Women. She was a member of the National Organization for Women, the American Chemical Society, the Radiation Research Society, the American Association for Advancement of Science, and other professional organizations. Survivors include her husband, two sons, a daughter, a granddaughter, and a sister, Laurelle Thompson Marsch ’49.