Journalists have bestowed on Peter Singer the tag of “world’s most influential living philosopher.” They are probably thinking of his work on the ethics of our treatment of animals, often credited with starting the modern animal rights movement, and with the influence that his writing has had on the development of effective altruism. He is also known for my controversial critique of the sanctity of life ethics in bioethics.
Several key figures in the animal movement have said that his book Animal Liberation, first published in 1975, led them to get involved in the struggle to reduce the vast amount of suffering we inflict on animals. To that end, he co-founded the Australian Federation of Animal Societies, now Animals Australia, the country's largest and most effective animal organization. Peter and his wife Renata stopped eating meat in 1971.
He is the founder of The Life You Can Save, an organization based on his book of the same name. It aims to spread his ideas about why we should be doing much more to improve the lives of people living in extreme poverty, and how we can best do this.