Nicholas Carnagey is visiting professor of psychology at Wake Forest University in Winston-Salem, N.C., and co-author of the chapter “Violent Evil and the General Aggression Model” in The Social Psychology of Good and Evil.

Sung Hee Kim is an associate professor of psychology and a member of the social psychology core group at the University of Kentucky in Lexington. Her research interests include conflict, group processes and vengeance.

Craig Anderson is a psychology professor at Iowa State University in Ames and co-author of “Violent Evil and the General Aggression Model” in The Social Psychology of Good and Evil. 

Arlin J. Benjamin Jr. is a social psychologist at University of Arkansas-Fort Smith. In his research, he applies social psychological theories of aggression to help understand how torture and genocide happen. He is the author of “Human aggression and violence: Understanding torture from a psychological perspective,” published in National Social Science Journal in 2006.

Jack Glaser is a social psychologist and assistant professor of public policy at the Goldman School of Public Policy at the University of California-Berkeley. He studies the social psychology of hate crimes and intergroup violence.

Elliot Aronson is emeritus professor of psychology at University of California, Santa Cruz, and author of Nobody Left to Hate: Teaching Compassion After Columbine. 

Adam Cohen is an assistant professor of social psychology at Arizona State University in Tempe. His interests include moral judgment.

Keith Akers is a Christian vegetarian and environmental activist who lives in Englewood, Colo. He operates the Compassionate Spirit website, which includes articles and commentary on animal welfare from a Christian perspective.

Andrew Isenberg is a history professor at Temple University in Philadelphia. He is an expert on the history of American environmentalism, especially in the American West. He contributed a chapter on the moral ecology of wildlife to the book Representing Animals.