Richard Besser is ABC News’ chief health and medical editor. In this role, he provides medical analysis and commentary for all ABC News broadcasts and platforms, including World News with David Muir, Good Morning America, and Nightline.

Dominic Johnson received a D.Phil. in evolutionary biology from Oxford University and a Ph.D. in political science from Geneva University.

Peter Staley has been a long-term AIDS and gay rights activist, first as a member of ACT UP New York, then as the founding director of TAG, the Treatment Action Group. He served on the board of the American Foundation for AIDS Research (amfAR) for 13 years.

Scott Atran is currently Research Professor and Presidential Scholar at the Center on Terrorism at John Jay College of Criminal Justice, and Visiting Professor of Psychology and Public Policy at the University of Michigan.