Graham Hill

Founder of Life Edited & TreeHugger.com

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

Slavoj Žižek

Philosopher & International Director of the Birkbeck Institute for the Humanities

Spencer Wells

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

Raj Patel

Award-Winning Writer, Food Politics Activist, Filmmaker & Academic

An Phung

Multimedia Journalist

Calvin Trillin

Author, Columnist, Humorist & Political Satirist

General Wesley Clark

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

Eric Foner

Prominent Historian & Professor Emeritus of History at Columbia University

Kenneth Roth

Executive Director at Human Rights Watch

Amy Gutmann

United States Ambassador to Germany; Former President of UPenn

Jim Wallis

Theologian, Writer, Political Activist & Racial Justice Advocate

Lisa Witter

Partner and Chief Change Officer, Fenton

Interview Lisa Witter (English)

David Bellos

Translator

Tim O'Brien

Pulitzer Prize Winning Novelist for "The Things They Carried"

Rob Huebel

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

Jacques Pépin

Master French Chef; Food Columnist; Cookbook Author Educator

David Remnick

Editor, The New Yorker

Neil Giuliano

Gay Rights Activist & President and CEO of Greater Pheonix Leadership

Ira Byock

Dartmouth-Hitchcock Medical Center

Peter Rojas

Co-founder of Gizmodo and of Engadget

Melissa Harris-Lacewell

Professor, Princeton University

Ingrid Newkirk

President, PETA

Stephen Walt

Robert and Renee Belfer Professor of International Affairs at Harvard University

Stephen M. Walt | Realism & Balance of Threat | GREAT MINDS

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"

Joel Klein

Lawyer, Author & Former Chancellor of the New York City Department of Education

Matthew Modine

Actor / Activist

Kurt Andersen

Host of "Studio 360 from PRI and WNYC" & Author

Tommy Thompson

Secretary of Health and Human Services (2001-2005)