Lauren M Robinson is an animal welfare scientist and psychologist specializing in the welfare, personality, and cognition of animals and has multiple publications across these topics. She has a Ph.D. in psychology and wrote her thesis on nonhuman primate personality and welfare. She has worked across several countries (UK, US, and Austria) and done postdoc work in animal behavior and endocrinology, animal joy, and canid cognition and cooperation for universities including UCLA and the University of Veterinary Medicine Vienna. Her work has spanned zoos, research facilities, and sanctuaries and she has worked with more than a dozen species, including half a dozen nonhuman primate species, wolves and dogs, and even the occasional Nubian goat.Alexander Weiss has been a lecturer in Psychology at the University of Edinburgh since 2005. Prior to that, he was a postdoctoral researcher at the Laboratory of Personality and Cognition at the National Institute on Aging in Baltimore, Maryland. He did his Ph.D. on genetic and environmental contributions to personality and subjective well-being in captive chimpanzees. Alex is a member of the Scottish Primate Research Group and a Fellow of the Royal Society of Biology. He has been involved continuously in leading or collaborating on projects related to personality, aging, well-being, and health in nonhuman primates, humans, and other animals, and has co-edited three other volumes, and published many articles and chapters on his research.