Rick Santorum

Former Member of the U.S. Senate

Sebastian Copeland

Adventurer, Environmental Activist, Award-Winning Photographer, Author, Lecturer & Founder of the Sedna Foundation

Grover Norquist

Founder & President of Americans for Tax Reform, Author, Board Member of the Center for the National Interest, The Parental Rights Organization & The National Rifle Association

William A. Galston

Wall Street Journal Columnist; Ezra K. Zilkha Chair and Senior Fellow for Governance Studies at The Brookings Institution

Alison Gopnik

Professor & World Leader in Children's Learning and Development

Melissa Chiu

Museum Director, Asia Society

Damon Horowitz and Jody Lewen

Prison University Project

Michelle Garcia Winner

Founder of Social Thinking

Matt Bai

Nationally Known Journalist, Author & Screenwriter; Political Thought Leader

Erling Kagge

Norwegian Polar Explorer; Author of "Silence: In the Age of Noise" & "Philosophy for Polar Explorers"

Robert William Fischer PhD

Philosophy Professor at Texas State University

James K. A. Smith

Author, Professor of Philosophy at Calvin College & Editor-In-Chief of Image Journal

Adrian N. Carter

CEO of the Carter Development Group; Expert on Conflict Resolution

Thomas Pogge

Philosopher Thomas Pogge wants to ensure medications get to those who need it most. He has published on a wide range of subjects such as global justice and human rights.

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