Katherine C. Grier is professor of material culture studies in the University of Delaware’s Winterthur Program in Early American Culture. She has studied the relationships between humans and animals, and her books include Pets in America: A History (2006).

David Dion DeGrazia is a philosophy professor at George Washington University in Washington, D.C. He has written about the ethics of animal research and is the author of Animal Rights: A Very Short Introduction.

Lori Gruen is an associate professor of philosophy and of women’s studies at Wesleyan University in Middletown, Conn. Among her areas of interest is injustice to animals. As a guest on a May 11, 2004, podcast of Philosophy Talk, she discussed the morality of eating animals.

Stephen Matthew Feldman is a professor at the college of law at the University of Wyoming in Laramie. He edited the book Law and Religion: A Critical Anthology (New York University Press, 2000).

James T. Richardson is Emeritus Foundation Professor of Sociology and Judicial Studies at the University of Nevada, Reno. He wrote the essay “Public Policy Toward Minority Religions in the United States: A Model for Europe?” for the book Religion and Public Policy.

David E. Wilkins is co-author of Uneven Ground: American Indian Sovereignty and Federal Law (University of Oklahoma Press, 2001) and associate professor of American Indian studies, political science and law at the University of Minnesota, Twin Cities.

Betsy Nessen Merrill is director of development and communications for AltWeb, the Alternatives to Animal Testing website, a project of the Johns Hopkins Center for Alternatives to Animal Testing in Baltimore.

Alan Goldberg is a professor of environmental health sciences and director of the Johns Hopkins Center for Alternatives to Animal Testing. The center works with scientists to find new methods to replace laboratory animals in experiments, reduce the number of animals tested and refine necessary tests to eliminate pain and distress. It is based in Baltimore.

Dr. Larry Carbone is a veterinarian at the University of California, San Francisco. He is the author of What Animals Want: Expertise and Advocacy in Laboratory Animal Welfare Policy.