Slavoj Žižek

Philosopher & International Director of the Birkbeck Institute for the Humanities

Randy Cohen

Writer, Known for "The Ethicist"

Tim O'Brien

Pulitzer Prize Winning Novelist for "The Things They Carried"

Peter Rojas

Co-founder of Gizmodo and of Engadget

Matthew Modine

Actor / Activist

Rebecca MacKinnon

Founding Director of Ranking Digital Rights

Eric Greitens

Missouri Governor; Former Navy SEAL and Founder of The Mission Continues; Best-Selling Author of "Strength and Compassion and The Heart and the Fist"

Kenneth Roth

Executive Director at Human Rights Watch

Dana Gioia

Poet; Former Chairman, National Endowment of the Arts

Naomi Wolf

Bestselling Author; Social Activist; Former Political Advisor to Al Gore and Bill Clinton

Shashi Tharoor

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

Alison Gopnik

Professor & World Leader in Children's Learning and Development

Michael Gazzaniga

President of the Cognitive Neuroscientist Institute & Author of "Tales from Both Sides of the Brain: A Life in Neuroscience"

Tales from Both Sides of the Brain: A Life in Neuroscience

Dalia Mogahed

President and CEO, Mogahed Consulting, LLC; Author, "Who Speaks for Islam?"

Jim Wallis

Theologian, Writer, Political Activist & Racial Justice Advocate

Christ in Crisis: Why We Need to Reclaim Jesus

Daniel Dennett

Professor of Philosophy at Tufts University

David Bellos

Translator

Ingrid Newkirk

President, PETA

Tommy Thompson

Secretary of Health and Human Services (2001-2005)

Andrew Cohen

Founder, EnlightenNext

Tal Ben-Shahar

Best-Selling Author & Positive Psychology Expert

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

Robert Thurman

International Authority on World Religions and Spirituality

Rob Huebel

Actor, Comedian & Writer; Known for his Role in "Children's Hospital" and "Transparent"

Shirley Tilghman

Molecular Biologist; Pres., Princeton University

Jason Kottke

Designer of Silkscreen Typeface, Lifetime Achievement Award Blogger

Gillian Caldwell

CEO of Global Witness

Melissa Chiu

Museum Director, Asia Society

Carl Pope

Senior Advisor to UN Envoy for Cities and Climate; Former CEO and Chairman of the Sierra Club

Francis Fukuyama

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

Defying Authoritarianism with the Resilient Power of Democracy