Peter Singer often cites various philosophers in his work, but one of the most famous philosophers he quotes is ** utilitarian philosopher **; however, it would depend on the specific context of the text you're referencing. If you are asking about a specific work by Singer, please provide more details for a more accurate answer. In general, he might discuss various philosophers including Plato, Sartre, Aquinas, and Rand depending on the topic at hand.
If I had to make an educated guess based on common references in ethical discussions, I would suggest Plato as a well-known philosopher he might reference.
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