Just did a quick Google search on him ... oh brother! From The International Vegetarian Union web site ...
Peter Singer is now a Professor at Princeton University, USA. He was formerly Professor of Philosophy and Director of the Centre for Human Bioethics at Monash University, Melbourne, Australia. He is the author of Animal Liberation, which can be considered the Bible of the animal rights movement. Recently, he has been instrumental in the formation of the The Great Ape Project, which seeks to extend personhood and legal rights to the Geat Apes.
I often avoid reading things like that because I become so frustrated and angry. I sit and ask myself "How can people think like this?" over and over again and I can never find an answer. The only thing that can explain it is that they have no sense of right and wrong at all.