Lidia Bastianich

Celebrity Chef, Author, Host of "Lidia's Kitchen"

General Wesley Clark

Retired Four-Star Army General & Former NATO Supreme Allied Commander

Vali Nasr

Professor of International Affairs & Middle East Studies at Johns Hopkins University

Islamic Leviathan: Islam and the Making of State Power (Religion and Global Politics)

Amy Gutmann

United States Ambassador to Germany; Former President of UPenn

Lisa Randall

Award-Winning Physicist & Author

Dark Matter and the Dinosaurs: The Astounding Interconnectedness of the Universe

Graham Hill

Founder of Life Edited & TreeHugger.com

Karen Armstrong

Founder of The Charter for Compassion

George Kohlrieser

Organizational, Clinical & Police Psychologist; Former Hostage Negotiator

Kay Warren

Christian Author

Shirley Tilghman

Molecular Biologist; Pres., Princeton University

James Gleick

Author, Journalist, and Biographer Whose Books Explore the Cultural Ramifications of Science and Technology

Gerry Adams

President, Sinn Fein

Shashi Tharoor

Diplomat & Author; Former United Nations Under-Secretary-General

Anita Allen

Henry R. Silverman professor of Law, Professor of Philosophy, and Vice Provost for Faculty, University of Pennsylvania

Seth R. Bordenstein

Scientist, Educator, Founder & Professor in Microbiome and Virome Sciences

The One Health Microbiome Center at Penn State (Introduction)

Karen Duffy

Author of "Wise Up: Irreverent Enlightenment from a Mother Who's Been Through It;" Former Actress, Model and Recreational Therapist.

Robert P. George

Founding Director of the James Madison Program in American Ideals and Institutions; Professor at Princeton University

Alex Epstein

Founder, Center for Industrial Progress Author, Fossil Fuels Improve the Planet

Timothy Patrick McCarthy

Award-Winning Scholar, Educator & Human Rights Activist; Faculty Member at Harvard University's Graduate School of Education and John F. Kennedy School of Government

Reckoning with History: Unfinished Stories of American Freedom

Daniel Okrent

Journalist, Best-Selling Author & Former New York Times Public Editor

Martha Nussbaum

Ernst Freund Distinguished Service Professor of Law and Ethics, University of Chicago

Spencer Wells

Geneticist, Anthropologist, Author, Entrepreneur, Adjunct professor at the University of Texas at Austin

Amy Goodman

Host & Executive Producer, Democracy Now!

Francis Fukuyama

Global Affairs Thought-leader and Professor; Author and Global Economy Expert

Defying Authoritarianism with the Resilient Power of Democracy

Esther Dyson

Executive Founder of Way to Wellville

An Phung

Multimedia Journalist

Nicholas Lemann

Dean, Columbia Univ. School of Journalism

Susan Schneider

NASA-Baruch Blumberg Chair at the Library of Congress , Philosopher, Cognitive Scientist & Author of "Artificial You: AI and the Future of the Mind"

AI, Radical Brain Enhancement and the Nature of Consciousness

Pardis Sabeti

Infectious Disease Expert & Professor at Harvard University

Daniel Dennett

Professor of Philosophy at Tufts University