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

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"

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 Zimmern

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

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

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

Bharat Balasubramanian

Professor at the University of Alabama College of Engineering; Former Vice President of Group Research and Advanced Engineering and Product Innovations & Process Technologies at Daimler AG

Blaise Agüera y Arcas

Leading AI Researcher, Works on Machine Intelligence at Google; Former Architect of Bing Maps and Bing Mobile

Ubi Sunt

Bob Harper

Personal Trainer & Former Host of "The Biggest Loser;" Heart Attack Survivor

Maintaining A Healthy Body & Mind | Bob Harper Q&A

Bob Schieffer

Former Moderator of “Face The Nation” & Chief Washington Correspondent for CBS News

Bob Vila

Home Improvement Expert; Former Host of "This Old House" and "Bob Vila's Home Again," Among Other Shows

Brad Meltzer

Host of History Channel’s "Lost History" & "Brad Meltzer’s Decoded;" New York Times Best-Selling Author