I have known Don for many years, indeed he was my PhD examiner, and we had great discussion then! He was the first professor of Animal Welfare in the world - a truly amazing pioneer. Always thoughtful and thought-provoking. We discuss his early career and influences, the emergence of animal welfare as a scientific field, as well as how he has got interested in the evolution of morality and religion and his greatest achievements. Essential listening for anyone interested in animal welfare and scientific thinking.