Yale University's Program in Ethics, Politics, and Economics is pleased to announce that Peter Singer, Ira W. DeCamp Professor of Bioethics in the University Center for Human Values at Princeton University, will be delivering this year's Castle Lecture Series, entitled "Effective Altruism." Effective altruism is a new movement consisting of many individuals and several independent organizations, all focused on the deceptively simple idea that we should try to do as much good as we can. The first lecture, entitled "What is Effective Altruism?" will introduce the idea of effective altruism by way of effective altruists themselves, describing how they live, and why they have chosen to live that way. The second lecture, "Altruism," will consider how altruism can emerge from evolutionary processes and how, paradoxically, acting in a manner that is genuinely altruistic can also be a good choice for ourselves. The third, "Effectiveness," will explore the practical implications of effective altruism; if we are going to live altruistically, what should we do?