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Peter Singer is an Australian moral philosopher. He specializes in applied ethics and approaches ethical issues from a secular, utilitarian perspective. He is known in particular for his book, Animal Liberation, a canonical text in animal rights/liberation theory. For most of his career, he supported preference utilitarianism, but in his later years became a ;classical or hedonistic utilitarian, when co-authoring The Point of View of the Universe with Katarzyna de Lazari-Radek.