Dean Karlan

Behavioral Economist, Social Entrepreneur & Author

Jimmy Carter

Former United States President (1977-1981), Author

Bill Duke

Filmmaker & Actor Known for "Commando" and "X-Men: The Last Stand"

Wyclef Jean

Grammy Award Winning Musician, Formerly in Band "The Fugees"

Rory Stewart

Foreign Affairs & Human Rights Expert

Gro Harlem Brundtland

Former Director-General, World Health Organization

Robin Wright

Foreign Policy Analyst, Journalist & Author of "Rock the Casbah: Rage and Rebellion across the Islamic World"

Robert D. Kaplan

Best-Selling Author & Atlantic Monthly Correspondent

Maajid Nawaz

Counter-Extremism Activist

David Goodman

New York Times Best-Selling Author & Journalist

Bernard Kouchner

Former Minister of Health of France; Founder of Nobel Peace Prize-Winning Médecins Sans Frontières

Planet Money

NPR's Multimedia Team on the Global Economy

Kathy LeMay

Founder, President & CEO of Raising Change

Evelyn Hu-DeHart

Professor of History; Director of the Center for the Study of Race & Ethnicity in America at Brown University

Why Are There So Many Asians in Latin America and the Caribbean?

Beth Simone Noveck

Founder & Director of The Governance Lab; Professor & Author of "Solving Public Problems"

Xavier Sala-i-Martin

Chief Economic Advisor to the World Economic Forum

Somaly Mam

Survivor & Anti-Sex Slavery Activist

Stephanie N. Mehta

CEO & Chief Content Officer of Mansueto Ventures

Mahathir Bin Mohamad

Former Malaysia Prime Minister

Mike Farrell

Actor & Human Rights Activist, Best Known for his Role in "M*A*S*H"