A distinguished professor of anthropology, Dr. Kristen Hawkes has advanced the study of age and sex differences in behavior among modern hunter-gatherers. She has co-directed two major field projects, among the Paraguayan Ache and the Tanzanian Hazda, that have produced the most extensive data so far on modern forager ecology.
Dr. Hawkes is best known for her research that produced the Grandmother Theory, to explain why humans in hunter-gatherer societies have longer life spans and produced more offspring than our closest relatives, the chimpanzees. She theorizes women are able to bear more children due to the help of grandmothers participating in the care taking. The strongest and healthiest grandmothers are likely to pass on their genes to more grandchildren, and over time, a longer life span would result from natural selection.