Hetty Van de RijtThe late Hetty van de Rijt received her PhD at Cambridge University as a physical anthropologist. With her husband, Dr. Plooij, she studied infant development in free-living chimpanzees with Dr. Jane Goodall in the Gombe National Par. As a researcher at the University of Amsterdam, she studied the development of human babies in their home environment through direct observations, filming, and in-depth interviews with their parents. Read More Read Less