In this episode of the Waking Up podcast, Sam Harris speaks with Oxford philosopher William MacAskill about effective altruism, moral illusions, existential risk, and other topics.

William MacAskill is an Associate Professor in Philosophy at Lincoln College, Oxford. He was educated at Cambridge, Princeton, and Oxford. He is one of the primary voices in a movement in philanthropy known as “effective altruism” and the cofounder of three non-profits based on effective altruist principles: Giving What We Can, 80,000 Hours, and the Centre for Effective Altruism. William is the author of Doing Good Better: Effective Altruism and a Radical New Way to Make a Difference.