William MacAskill

Oxford philosopher who co-founded the effective altruism movement and 80,000 Hours — and whose later work on longtermism argues that reducing existential risk is the most pressing moral priority.

EA institutionalization: MacAskill co-founded Giving What We Can, 80,000 Hours, and the Centre for Effective Altruism — building the institutional infrastructure of EA. Doing Good Better popularized EA reasoning for a mass audience. What We Owe the Future: the most rigorous and high-profile defense of strong longtermism — the view that we should give priority to the welfare of future generations because the potential future population vastly outnumbers present people. Among the most influential young philosophers in terms of real-world impact.