Tony Porter

Educator & Activist Internationally Recognized For His Effort To End Violence Against Women

Dr. Carl Hart

Professor of Psychology & Chair of Department of Psychology at Columbia University

Jeff Allen

Stand-up Christian Comedian; Marriage Motivator

Stuart Firestein

Scientist; Advocate for the Public Understanding of Science

Camryn Manheim

Actress; Human Rights Activist; Writer & Producer

Claire Robinson

Known for "5 Ingredient Fix" on Food Network

Dolvett Quince

Fitness Guru & Trainer from "The Biggest Loser"

Stephen Lewis

Celebrated Humanitarian and Former UN Special Envoy for HIV/AIDS in Africa

Ali Vincent

First Female Winner of "The Biggest Loser"

Blythe Danner

Emmy Award-Winning Actress & Activist

Nancy Snyderman, MD

Retired Surgeon & Award-Winning Medical Journalist

Dan O'Brien

Olympic Gold Medalist & Decathlon Champion

Rishi Manchanda

Physician, Public Health Innovator, President & CEO of HealthBegins

Clay Walker

Country Music Artist Known For "What's It to You" & Multiple Sclerosis Survivor & Founder of Band Against MS

Eleanor Longden

Mental Health Advocate & Speaker; Postdoctoral Service User Research Manager at Psychosis Research Unit

Compassion for Voices: a tale of courage and hope

Phaedra Parks

Producer, Entertainment Attorney & Cast Member of Bravo's "The Real Housewives of Atlanta"

Vilayanur Ramachandran

Neuroscientist; Director of the Center for Brain & Cognition, University of California, San Diego

Deborah Roberts

ABC News Network Correspondent; Author, "Been There, Done That: Family Wisdom For Modern Times"

Anthony Atala

Director, Wake Forest Institute for Regenerative Medicine

Philip Zimbardo

Psychologist Known for the Notorious '1971 Stanford Prison Experiment;' Researcher of the Psychology of Heroism, Evilness and Time

Michelle Aguilar

Winner of NBC's "The Biggest Loser" Season 6, Author, Motivational Speaker

Bill Kurtis

TV Journalist, Producer, Narrator and News Anchor; Host of A&E's "Investigative Reports," "American Justice" and "Cold Case Files"

Dr. Travis Stork

Bestselling Author, Emergency Medicine Physician & TV Personality Known for "The Doctors"

Alan Alda

Actor; Writer; Science Advocate; Director

Dr. Lisa Masterson

OB/GYN, Mom, Philanthropist & Author; Known as Co-Host of "The Doctors"

Michael C. Anthony

Stage Hypnotist, Body Language Expert & Bestselling Author, "Body Language Secrets"

Olivia Ward

Winner of "Biggest Loser" Season 11

Tony Horton

Fitness Expert & Founder of Fitness Program P90X

Crush It!: The Revolutionary Fitness Plan for All Levels That Burns Fat, Builds Muscle,...

Richard Resnick

CEO of Cureatr

Richard Petty

Former NASCAR Race Car Driver