Adam Ostrow

Chief Digital Officer, TEGNA

Al Roker

Co-Host NBC Today Show Media Entrepreneur, Author

Alan Cooper

Software Designer and Author, Known for Humanizing Technology

Alexa von Tobel

Founder & CEO of Learnvest.com; New York Times Bestseller Author of "Financially Fearless"

Alexandra Cousteau

Environmental Activist, Storyteller & Ocean Advocate

Alexis Madrigal

Senior Editor at The Atlantic & Author of "Powering the Dream: The History and Promise of Green Technology"

Amory Lovins

Co-Founder & Chairman Emeritus of Rocky Mountain Institute

Andrea Mitchell

Host of MSNBC’s "Andrea Mitchell Reports" & Chief Foreign Affairs Correspondent for NBC News

Andrea Mitchell - Celebrating 15 years of "Andrea Mitchell Reports"

Andres Barreto

Founder of Onswipe, Grooveshark and Socialatom Group

Andrew McAfee

Co-Founder & Co-Director of Initiative on the Digital Economy; Principal Research Scientist at MIT Sloan School of Management

MIT Scientist On The Radical Mindset that Drives Extraordinary Results

Andrew Sullivan

Writer-at-large at New York; Former Editor-in-Chief of The New Republic Magazine & Political Blogger

Andrew Zimmern

Four-Time James Beard Award-Winning TV Personality, Chef, Writer & Teacher

Anna Deavere Smith

Award-Winning Actress, Playwright & Social Commentator

Anne-Marie Slaughter

Foreign Policy Expert, Author & CEO of New America Foundation

Anousheh Ansari

CEO of X Prize Foundation & First Female Private Space Explorer

Antonio Damasio

Director of the Brain Institute

Antonio Villaraigosa

41st Mayor of Los Angeles

Arne Duncan

Managing Partner at Emerson Collective; Former U.S. Secretary of Education

Austan Goolsbee

Chairman, President's Council of Economic Advisers (2010-2011) and Professor of Economics, University of Chicago Booth School of Business

Beth Simone Noveck

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