Sir Richard Branson

Businessman & Founder of Virgin Group

Julia Bolz

Women's Rights Activist

Josh Lieb

Executive Producer, "The Daily Show"

Nelson George

Author / Filmmaker

Robert Hormats

Vice Chairman of Kissinger Associates Inc.

Aubrey de Grey

Biomedical Gerontologist; Chief Science Officer of SENS Research Foundation; Researcher on Preventing Aging

Esther Dyson

Executive Founder of Way to Wellville

Andrew Carmellini

Award-Winning Chef & Restaurateur

Van Jones

CEO of REFORM Alliance, CNN host, Emmy Award-winning Producer & NY Times Best-Selling Author

Amy Goodman

Host & Executive Producer, Democracy Now!

Nicholas Carr

Writer on the Intersection of Technology, Economics & Culture; Author "The Shallows" & "The Glass Cage"

Jason Kottke

Designer of Silkscreen Typeface, Lifetime Achievement Award Blogger

Noam Chomsky

Professor of Linguistics and Philosophy at MIT & Foreign Policy Author

Tom Freston

Principal, Firefly3; Former CEO, Viacom Inc.

Adam Platt

Restaurant Critic, New York Magazine

Ricky Gervais

Award-Winning English Comedian & Actor; Known for "The Office" and "Extras"

Maddy Dychtwald

Co-Founder & Senior VP of Age Wave, Author & Changing Demographics Trends Expert

Sara Horowitz

Founder & Executive Director of Freelancers Union

Gillian Caldwell

CEO of Global Witness

Lee Hamilton

Member, President's Homeland Security Advisory Council; Director, Center on Congress, Indiana University

Jonathan Haidt

Professor of Ethical Leadership at New York University, Stern School of Business; Author of NYT Bestseller "The Righteous Mind"

The Anxious Generation: How the Great Rewiring of Childhood Is Causing an Epidemic of M...

Carol Gilligan

Human Condition Psychologist & Ethicist; Founder of Difference Feminism

Jonathan Safran Foer

Bestselling Author of "Everything Is Illuminated" and "Extremely Loud and Incredibly Close"

Gloria Estefan

Grammy Award-Winning Latin Musician

William Easterly

Professor of Economics at New York University; Co-Director, Development Research Institute

Jimmy Carter

Former United States President (1977-1981), Author

Donald Rubin

Co-Founder, Rubin Museum of Art

Richard Gelles

Dean of The School of Social Policy & Practice, University of Pennsylvania

James Sherman

Founder & CEO, Shermans Travel Media

Maria Popova

Editor of Brain Pickings; Author of "Figuring"