In a world in which many humans do not have all their human rights fulfilled, who has what obligations to help bring a better world about? This is a question that, for many years, has exercised the mind of Thomas Pogge, Professor of Philosophy and International Affairs at Yale and Professorial Fellow at the Australian National University. This week, we talk to him about it by way of a chat about two influences on his thought: the great eighteenth century German philosopher Immanuel Kant, and one of his teachers, John Rawls, the distinguished American moral philosopher who died in 2002.