Dr Peter Singer, an Australian-born philosopher who is Professor of Bioethics at Princeton University.  Singer's writings consistently elevate the rights of animals above disabled or unborn human beings, including the advocacy of infanticide.  He has openly indicated that the 'old' ethical order his teachings are intended to supplant is one based on the Genesis teaching of mankind made in the image of God. Which of course he regards as untenable due to his evolutionary belief that all life emerged naturally from chemicals to its present state of order over millions of years.