Arthur G. Miller is a psychology professor at Miami University in Oxford, Ohio, and editor of The Social Psychology of Good and Evil.

Martha K. Huggins is Charles A. and Leo M. Favrot Professor of Human Relations at Tulane University in New Orleans and co-author of Violence Workers: Police Torturers and Murderers Reconstruct Brazilian Atrocities.

Danny L. Balfour is a professor and past director of the School of Public and Nonprofit Administration at Grand Valley State University in Grand Rapids, Mich. He is co-author of Unmasking Administrative Evil and of “Abu Ghraib, Administrative Evil, and Moral Inversion: The Value of ‘Putting Cruelty First’ ” in the September/October 2006 issue of Public Administration Review.

Susan Fiske is a psychology professor at Princeton University and co-author of a 2004 Science magazine article, “Policy Forum: Why ordinary people torture enemy prisoners.”

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.