Tim Tebow

ESPN College Football Analyst; Heisman Trophy Winner; Former Quarterback for NFL's Denver Broncos & Baseball Outfielder for the New York Mets

Jonathan Bush

Co-Founder, President, Chairman & CEO of athenahealth

Keller Rinaudo

Co-founder and CEO of Zipline

Michael Leavitt

Former Governor of Utah and Secretary of Health and Human Services in the Bush Administration

Joy-Ann Reid

MSNBC Correspondent, Political Author & Former Host of "The Reid Report"

Mia Farrow

Acclaimed Actress & Humanitarian Activist

Dr. Dean Ornish

Physician, Leading Researcher in Healthcare, Founder of the Preventive Medicine Research Institute & Bestselling Author

Tonya Lewis Lee

Author, Producer & Activist

David Byrne

Musician, Artist & Author; Co-founder of the Band "Talking Heads"; Founder of Positive News Magazine "Reasons to be Cheerful"

David Mitchell and David Byrne: Utopia Avenue

Tim O'Reilly

Founder & CEO of O'Reilly Media

Rudolph E. Tanzi

Alzheimer's Disease Researcher; Expert on the Genetics of Neurological Disease; Professor of Neurology at Harvard Medical School

Lynsey Addario

American Photojournalist; Contributor for National Geographic & Time Magazine

Dennis Kucinich

Fox News Contributor, Former Ohio US Representative and Two-Time Presidential Candidate

Dr. M. Joycelyn Elders

Former Surgeon General of the United States

John Zogby

Trendspotter & Leading Pollster

Danny Hillis

Author & Co-Founder and Co-Chairman of Applied Minds

Juan Williams

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

Julie Gerberding, MD

Infectious Disease Expert; Former Director of the U.S. Centers for Disease Control & Prevention (CDC)

Ralph Nader

Former Presidential Candidate for the Green Party, Consumer Advocate & Independent

Bernard Kouchner

Former French Minister of Foreign & European Affairs