“When chimps threaten, they open their mouth and show their teeth. It's a little like waving a knife in front of you. It's very primitive, and therefore bizarre.”

American anthropologist, human behavior researcher, and self-help author

Helen Elizabeth Fisher was an American anthropologist, human behavior researcher, and self-help author. She was active in the late 20th and early 21st centuries, and is known for her work on human behavior and relationships. Fisher was a biological anthropologist and served as a senior research fellow at The Kinsey Institute of Indiana University. She was also a member of the Center for Human Evolutionary Studies in Rutgers University’s Department of Anthropology. Before that, she worked as a research associate at the American Museum of Natural History in New York City.