In this episode of the podcast, Sam Harris speaks with William MacAskill about how to do the most good in the world. They discuss the “effective altruism” movement, choosing causes to support, the apparent tension between wealth and altruism, how best to think about generosity over the course of one’s lifetime, and other topics. William MacAskill is an Associate Professor in Philosophy and Research Fellow at the Global Priorities Institute, University of Oxford. He is one of the primary voices in a philanthropic movement known as “effective altruism” and the co-founder of three non-profits based on effective altruist principles: Giving What We Can, 80,000 Hours, and the Centre for Effective Altruism. He is also the Director of the Forethought Foundation for Global Priorities Research and the author of Doing Good Better: Effective Altruism and a Radical New Way to Make a Difference. Website: williammacaskill.com Twitter: @willmacaskill