John Reynolds is a Reader in Evolutionary Ecology at the University of East Anglia, England. His research focuses on the evolution of reproductive behaviour and life histories with an emphasis on implications for conservation of marine and freshwater fishes. He was awarded the FSBI medal of the Fisheries Society of the British Isles in 2000, and is co-author of Marine Fisheries Ecology (2001) and co-editor of The Fish and Fisheries Handbook (2002). Georgina Mace is the Director of Science at the Institute of Zoology, London. Her research concerns extinction risk assessment and she has had extensive involvement with the IUCN in developing systems for categorising the levels of threat used in Red Lists of threatened species. She was awarded the Order of the British Empire in 19 . She is co-editor of Creative Conservation (1994) and Conservation in a Changing World (1999, ISBN 0521632706). Kent Redford is Director of Biodiversity Analysis at the Wildlife Conservation Society, New York. His research interests focus on effects of human use on biodiversity conservation, parks and protected areas and wildlife use by indigenous peoples. He has also co-edited Neotropical Wildlife Use and Conservation (1991), Conservation of Neotropical Forests (1992) and Parks in Peril (1998). John G. Robinson is Senior Vice-President and Director of International Conservation at the Wildlife Conservation Society, New York. His research examines impacts of hunting on wildlife, particularly in tropical forests. He has worked on the IUCN's Sustainable Use Initiative and has has co-edited Neotropical Wildlife Use and Conservation (1991) and Hunting for Sustainability in Tropical Forests (2000).