Yvonne A. de Jong (PhD) is a Kenya-based Dutch primatologist who has worked in Africa for more than 10 years. She is the co-leader of the Eastern Africa Primate Diversity and Conservation Program, the Afro-tropical Regional Coordinator of the IUCN/SSC Wild Pig Specialist Group, member of the Nocturnal Primate Research Group at Oxford Brookes University, and Collaborating Scientist of the Institute of Primate Research in Nairobi. Her main research focus is the biogeography, diversity and conservation of eastern Africa's primates and several other groups of large mammals, including the warthogs.

Thomas M. Butynski (PhD) is a conservationist and ecologist who has worked in Africa for 35 years, mostly in Botswana, Kenya, Uganda and Equatorial Guinea. He is a member of four IUCN/SSC Specialist Groups (Primates, Antelopes, Afrotheria, Wild Pigs) and has served as Director of the Institute of Tropical Forest Conservation in Uganda, Director of Conservation International’s Eastern Africa Biodiversity Hotspots Program, Vice-Chair of the Africa Section of the IUCN/SSC Primate Specialist Group, Senior Editor of the journal, African Primates, Editor for Mammals of Africa, and as co-leader of the Eastern Africa Primate Diversity and Conservation Program. He now works for the Zoological Society of London as Director of the King Khalid Wildlife Research Centre in Saudi Arabia.