Sandra Fluke

Lawyer, Social Justice Advocate, Women's Health Expert

Andreas Schleicher

Deputy Director for Education and Skills and Special Advisor on Education Policy to the OECD's Secretary-General

Stuart Firestein

Scientist; Advocate for the Public Understanding of Science

Joe Ruffini

Anti-Terrorism, Information Security & Risk Minimization Expert

Dennis Avery

Former Director, Center for Global Food Issues at the Hudson Institute

Karen Pittman

Co-Founder & Former Executive Director of the Forum for Youth Investment

Rehema Ellis

Chief Education Correspondent at NBC News

Charles Limb

Associate Professor of Otolaryngology-Head and Neck Surgery

Alan November

International Leader in Education Technology & Author of NYT Bestseller "Who Owns the Learning?", Founder of November Learning

Jason Young

Former Senior-Level Manager at Southwest Airlines & Founder of Culturetopia

Tim Arthur

Group CEO of Time Out and BBC London 94.9 Sunday Breakfast Host

Story Musgrave, M.D.

Retired NASA Astronaut; Physician & Professor at Art Center College of Design

Uri Dadush

Senior Associate and Director, Carnegie's International Economics Program

Vanessa Ochs

Author of "Inventing Jewish Ritual", Winner of 2007 National Jewish Book Award, Professor of Religious Studies at University of Virginia

LaDonna Gatlin

Singer & Author; Sister of the Legendary Country Music Group, The Gatlin Brothers

Dr. Antonia Darder

Scholar, Artist, Poet, Activist & Public Intellectual

Mondo Guerra

Fashion Designer & Advocate for HIV/AIDS Awareness

Dale Dougherty

Founder of MAKE Magazine, Creator of Maker Faire, Founder & CEO of Maker Media

Tensie Whelan

Director of NYU's Center for Sustainable Business; Former President of the Rainforest Alliance

Lou Waters

Aging Expert, Journalist & Former CNN Media Personality; Anchor of "Coming of Age"

Where Are They Now: Lou Waters

Kevin Bales

Professor of Contemporary Slavery, & Research Director of the Rights Lab at the University of Nottingham; Co-Founder of Free the Slaves

Mark Lynas

Environmental Writer; Author of "Our Final Warning: Six Degrees of Climate Emergency"

Amber Jenkins

Applied Science Engineer, NASA’s Jet Propulsion Laboratory; Editor, NASA Climate Change Website

Bunker Roy

Founder of Barefoot College

Streeter Seidell

Comedian, Writer for SNL & Contributor to CollegeHumor.com

Yael Cohen Braun

Co-Founder & Board Chair of F*ck Cancer

Kate White

Former Editor-In-Chief of Cosmopolitan Magazine; New York Times Best-Selling Author

Brittney Griner

WNBA Player for the Phoenix Mercury & Author of "In My Skin"

Brittney Griner's first press conference since being released

Danny White

Arizona Rattlers Head Coach & General Manager

Olivia Ward

Winner of "Biggest Loser" Season 11