Peter Singer has been called "the world’s most influential living philosopher" as well as the father of the modern animal rights movement. He teaches at Princeton University and the University of Melbourne and is known especially for his work on the ethics of our treatment of animals, for his controversial critique of the sanctity of life doctrine in bioethics, and for his writings on the obligations of the affluent to aid those living in extreme poverty. In 2005 Time magazine named Singer one of the 100 most influential people in the world, and the Gottlieb Duttweiler Institute ranked him 3rd among Global Thought Leaders for 2013. Singer has written, co-authored, edited or co-edited more than 40 books, including Practical Ethics; The Expanding Circle; How Are We to Live?; Rethinking Life and Death; The Ethics of What We Eat (with Jim Mason); The Life You Can Save; and, most recently, The Most Good You Can Do. His works have appeared in more than 25 languages.