Samuel L. Gaertner is a psychology professor at the University of Delaware in Newark. He is a social psychologist and co-author of the chapter “Contemporary Racial Bias: When Good People Do Bad Things” in The Social Psychology of Good and Evil.

The Northeast Ohio Coalition for the Homeless is a nonprofit coalition of service providers, housing activists, members and homeless people that looks for solutions to homelessness.

Barbara Kellerman is the James McGregor Burns Lecturer in the Leadership at the Center for Public Leadership of the Kennedy School of Government at Harvard University and the author of Bad Leadership: What It Is, How It Happens, Why It Matters.

John F. Dovidio is a psychology professor at the Yale University. He is a social psychologist and co-author of the chapter “Contemporary Racial Bias: When Good People Do Bad things” in The Social Psychology of Good and Evil.

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.

The Louisville Coalition for the Homeless serves the homeless population of Louisville, Kentucky, by educating the community about homelessness, advocating for system changes and coordinating the community response. Natalie Harris is executive director.

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.