Dr Gus Mills has spent 40 years conducting research on African large carnivores and is currently Research Fellow at the Lewis Foundation, South Africa. He has written five books and authored or co-authored 140 scientific papers, as well as delivered over 80 talks at conferences and symposia worldwide. He is a senior member of several IUCN Carnivore Specialist Groups, including former Chair of the Hyaena Specialist Group, and member of the steering committees of the Cat Specialist Group and the Canid Specialist Group. He serves as a member on several boards of scientific journals and conservation organisations and has consulted widely on carnivore conservation issues in Africa and Asia.

Margie Mills holds a BSc degree in Zoology from Cape Town University. She worked with her husband, Gus, on the Kalahari hyaenas and cheetahs. She has co-authored a number of scientific papers with him on the brown hyaena and cheetah as well as two books.