chimpanzees sign language at University of Oklahoma (UO), caught her interest. She decided to study at UO instead, getting an MS degree and, in 1975, a Ph.D. in psychology, under the direction of William Lemmon, who ran UO's Institute for Primate Studies.^[1] Her dissertation, "Mother-infant behavior in group-living captive chimpanzees," examined the way captive animals used gestures and posture to communicate.

While