Peter Albert David Singer (born 6 July 1946) is an Australian moral philosopher. He is the Ira W. DeCamp Professor of Bioethics at Princeton University, and a Laureate Professor at the Centre for Applied Philosophy and Public Ethics at the University of Melbourne. He specialises in applied ethics and approaches ethical issues from a secular, utilitarian perspective. He is known in particular for his book Animal Liberation (1975), in which he argues in favour of vegetarianism, and his essay "Famine, Affluence, and Morality," in which he argues in favour of donating to help the global poor.

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