Gus Mills spent 34 years conducting research on African large carnivores with SANParks stationed in the Kgalagadi Transfrontier Park and the Kruger National Park. His initial work was on brown hyenas and spotted hyenas in the Southern Kalahari culminating in the publication of his book in 1990 “Kalahari hyenas: the comparative behavioural ecology of two species.” He studied lion and cheetah feeding ecology, ecological relationships between the large carnivores and wild dog population ecology in Kruger National Park. His study on wild dogs in Kruger ran for 15 years. He has supervised a number of PhD and MSc theses on lions, cheetahs, wild dogs, brown hyenas, honey badgers and African wild cats in different areas of Southern Africa. He was the founder of the South African Wild Dog Advisory Group, which is a broad based committee of interested and affected parties at both government and the private sector levels, whose aim is to improve the conservation status of this endangered species in South Africa. He has written four books and published over 120 scientific papers, as well as delivered over 80 talks at conferences and symposia worldwide. He is an Extraordinary Professor at Pretoria University, a senior member of several IUCN Carnivore Specialist Groups, including Chair of the Hyena Specialist Group, and member of the steering committee of the Cat Specialist Group, founder and past head of the Endangered Wildlife Trust’s Carnivore Conservation Group and serves as a member on several boards of scientific journals and conservation organizations. He has consulted widely on carnivore conservation issues in Africa and Asia. Recently retired from SANParks he is now a Research Fellow with The Tony and Lisette Lewis Foundation and in June 2006 started a five year cheetah study together with his wife Margie in the Kgalagadi Transfrontier Park.