Hilary Greaves

Hilary Greaves is a philosopher at the University of Oxford and co-director of the Global Priorities Institute, a research center focused on identifying and addressing humanity's most pressing problems. Her work centers on effective altruism, longtermism, and population ethics—examining how to allocate resources to do the most good, with particular emphasis on the moral weight of future generations. She has published extensively on these topics and is a prominent voice in debates about existential risk, moral uncertainty, and the ethics of artificial intelligence.

Greaves' research bridges academic philosophy and practical ethics, influencing both scholarly discourse and the effective altruism movement. She has contributed to foundational work on longtermism, the view that improving the long-term future should be a central moral priority, and has engaged with questions about how to reason under deep moral uncertainty.