Peter Singer

Peter Singer is an Australian moral philosopher and one of the most influential utilitarian thinkers alive today. His arguments on animal liberation, global poverty, and effective altruism have shaped both academic ethics and practical moral reform movements worldwide.

Singer's Animal Liberation applied the principle of equal consideration of interests to non-human animals, arguing that speciesism — like racism and sexism — is an unjustifiable prejudice. His essay Famine, Affluence, and Morality set out the demanding utilitarian case for radical redistribution to the global poor.