William MacAskill

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William MacAskill

Will MacAskill co-founded three charities (Giving What We Can, 80,000 Hours, and The Centre for Effective Altruism), authored Doing Good Better, and is best known as a co-founder of the effective altruism movement. He is an Associate Professor in Philosophy and Research Fellow at the Global Priorities Institute, University of Oxford.


His academic research focuses on the fundamentals of effective altruism - the use of evidence and reason to help others by as much as possible with our time and money, with a particular concentration on how to act given moral uncertainty.

Will has published two books: Doing Good Better - Effective Altruism and a Radical New Way to Make a Difference in 2015, and Moral Uncertainty in 2020.

His work has been published in Ethics, Mind, and The Journal of Philosophy, as well as The Guardian, Time, and the The New Yorker.

Hear more about his research in the following interview:

You can read profiles of Will at The Atlantic, Spear's, or his website.

Will's TED Talk

Will's message to our 5,000 members