Drew Houston

Co-Founder & CEO of Dropbox

Tyrese Gibson

R&B Singer, Actor & Author

Vandana Shiva

World-Renowned Environmental Leader

Elizabeth Cohen

Senior Correspondent for the CNN Health, Medical, & Wellness Unit

Elizabeth Cohen - CNN news story on baby formula shortage

Tonya Lewis Lee

Author, Producer, Filmmaker & Entrepreneur; Women's Health Activist

Tonya Lewis Lee on the Black maternal mortality crisis

Rachel Simmons

Internationally Recognized Educator & Best-Selling Author

John Zogby

Trendspotter & Leading Pollster

Brad Meltzer

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

Jon Landau

Academy Award-Winning Producer of Titanic & Avatar

Graham Hill

Founder of Life Edited & TreeHugger.com

Bernard Kouchner

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

Dr. M. Joycelyn Elders

Former Surgeon General of the United States

Ralph Nader

Consumer Advocate, Lawyer & Author; Former Independent Presidential Candidate

Juan Williams

New York Times Best-Selling Author, Fox News Political Analyst, Co-Host of "The Five" & Award-Winning Columnist

Philip Bredesen

Governor of Tennessee 2003-2011; Author, "Fresh Medicine: How to Fix Reform and Build a Sustainable Health Care System"

Rahm Emanuel

First Jewish Mayor of Chicago & Former White House Chief of Staff

Daniel Dae Kim

Actor, Director & Producer

Charisma Carpenter

Actress Known for "Buffy the Vampire Slayer" and Host of "Surviving Evil"

Carey Lohrenz

First Female F-14 Fighter Pilot in the U.S. Navy, Team-Building, Leadership & Strategy Expert

Wes Bentley

Film Actor; "American Beauty," "The Hunger Games"; FX's "American Horror Story"