The Australian writer and thinker is often described as the world’s most influential living philosopher. He is known especially for his work on the ethics of our treatment of animals, for his controversial critique of the sanctity of life ethics in bioethics, and for his writing on the obligations of the affluent to aid those living in extreme poverty. His books include Animal Liberation, Practical Ethics, The Most Good You Can Do, The Life You Can Save, Famine, Affluence and Morality, and most recently Ethics in the Real World: 82 Brief Essays on Things That Matter. He talks to the Festival president.