Dr. Ian Smith

Doctor, New York Times Bestselling Author, Medical Contributor & Host of "The Doctors"

Kevin Powell

Writer, Humanitarian, President of BK Nation

John Bohannon and Black Label Movement

Science writer + Dance troupe + Cellists

Wil Wheaton

Actor, Author & Blogger; Known for "Star Trek: The Next Generation" & "The Big Bang Theory"

Sean Astin

Actor, Director, Voice Artist & Producer Known For "Lord of the Rings"

Alexandra Cousteau

Environmental Activist, Storyteller & Ocean Advocate

Marlee Matlin

Academy Award Winning Actress; Healthcare Advocate & Disability Rights Activist Fighting for Better Access for the Deaf

Robert Ballard

Renowned Ocean Explorer & Scientist

Lisa Oz

Best-Selling Author, Producer, Host & Entrepreneur

Peter Salgo

Healthcare Futurist, Emmy Award-Winning Health & Science Correspondent & Author of "The Heart of the Matter"

Linda Armstrong Kelly

Single Mother of Lance Armstrong; Philanthropist & Advocate for Children

Vicki Lawrence

Actress, Comedian & Women's Activist; Best Known for her Characters on "The Carol Burnett Show"

Daryl Hannah

Actress, Best Known for "Kill Bill" & "Splash"; Environmental Activist

Jillian Michaels

Leading Fitness Expert, Certified Nutritionist, Renowned Life Coach & Powerful Entrepreneur

John Stossel

Emmy-Award Winning Journalist

Sinbad

Stand-Up Comedian & Actor

Sinbad is back after a stroke: ‘Miracles happen’

Judge Greg Mathis

Civil Rights Activist, Television Personality

John Cho

Actor Known for "Harold & Kumar" Series & "Star Trek" Reboot Series

Jodie Sweetin

Entrepreneur, Actress, Producer & Author

Diane Sawyer

Anchor, ABC World News