William MacAskill is an Associate Professor in Philosophy at Oxford University and Tutorial Fellow at Lincoln College. His research has two main focuses. The first addresses the issue of how one ought to make decisions under normative uncertainty; the second is on effective altruism: the use of evidence and reason to promote the wellbeing of all. His book on the topic, Doing Good Better, was published in 2015, and reviewed favorably in The London Review of Books, The Times Literary Supplement, The Guardian and The New York Times. In the future, he plans to work further on the theory and practice of effective altruism, including aggregating wellbeing, time-discounting, moral methodology, career choice and cause prioritisation. William is the Co-founder of three non-profits based on effective altruist principles: Giving What We Can (2009), 80,000 Hours (2011) and the Centre for Effective Altruism (2012). These organisations have collectively raised over $15 million for effective charities with a further $700 million in lifetime pledged donations, and sparked the ’effective altruism movement’, with thousands of members and over a hundred local groups around the the world.