Brooke Scelza is Professor of Anthropology at the University of California, Los Angeles, and co-director of the Kunene Rural Health and Demography Project in Namibia, where she has been working with Himba pastoralists since 2010 to study family dynamics and reproductive decision-making. She is a former president of the Evolutionary Anthropology Society.

Mary K. Shenk is Associate Professor of Anthropology, Demography and Asian Studies at the Pennsylvania State University. Her research focuses on marriage, parental investment, and fertility in South Asia where she has conducted fieldwork since 2001. She is a Fellow of the American Association for the Advancement of Science and former President of the Evolutionary Anthropology Society.