William MacAskill is an Associate Professor of Philosophy at Oxford University. His academic work spans a breadth of fields within normative philosophy, including practical ethics, population ethics, social choice theory and decision theory. At age 28, he became the youngest tenured professor of philosophy in the world. MacAskill is the cofounder of Giving What We Can, 80,000 Hours, the Centre for Effective Altruism and the Oxford University-based Global Priorities Institute. He's recognised as a World Economic Forum Young Global Shaper and a Forbes 30 Under 30 Social Entrepreneur.