Four Signs: References & Edit History

Article Contributors

Primary Contributors

• Peter Singer
  Peter Singer is the Ira W. DeCamp Professor of Bioethics at the University Center for Human Values, Princeton University. A specialist in applied ethics, he approaches ethical issues from a secular, preference-utilitarian perspective. He is a major proponent of biocentrism.
• The Editors of Encyclopaedia Britannica
  Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. They write new content and verify and edit content received from contributors.

Other Encyclopedia Britannica Contributors

• Amy McKenna