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

Jeffrey Rosen

President & CEO of the National Constitution Center & Contributing Editor of The Atlantic

Lesley Hazleton

Author of "The First Muslim," a New Look at the Life of Muhammad

Keisha N. Blain

Award-Winning Historian & Writer

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)

Aubrey de Grey

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

Peter Rojas

Co-founder of Gizmodo and of Engadget

Ingrid Newkirk

President, PETA

Noam Chomsky

Professor of Linguistics and Philosophy at MIT & Foreign Policy Author

David Remnick

Editor, The New Yorker

Thomas King

Award-Winning First Nations Writer

Gerry Adams

President, Sinn Fein

Charles Best

Founder and Former CEO, DonorsChoose.org

From Classroom To Crowdfunding

Lynn Novick

Award-Winning Director, Writer, Producer & Documentary Filmmaker on Culture, History, Politics, Sports, Art, Architecture, Literature, and Music

Pardis Sabeti

Infectious Disease Expert & Professor at Harvard University

George Kohlrieser

Organizational, Clinical & Police Psychologist; Former Hostage Negotiator

Kay Warren

Christian Author

Andrew Carmellini

Award-Winning Chef & Restaurateur

James Traub

Global Affairs & Politics Writer