Laila Ali

Undefeated Four-Time World Champion Boxer & Lifestyle Expert; Heart Disease Awareness Advocate

Nastia Liukin

Olympic Gold Medal Gymnast

Dan Ariely

Behavioral Economist; Professor at Duke University; Author; Founding Member of The Center for Advanced Hindsight

Richard Simmons

Fitness Instructor, Actor, Video Producer Known for "Sweatin' to the Oldies" Aerobics Videos

Ellie Krieger

Chef, Nutritionist, Best-Selling Author & Host of “Ellie’s Real Good Food”

Dr. Ian Smith

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

Art Smith

Celebrity Chef, Author & Humanitarian; Served as the Personal Chef of Oprah Winfrey

Ambassador Dennis Ross

Author, Counselor & William Davidson Distinguished Fellow at The Washington Institute; Former Special Assistant to President Obama

David Satcher, M.D., Ph.D.

16th US Surgeon General; Founding Director of the Satcher Health Leadership

Dr. Mike Magee

President of Positive Medicine, Inc., Health Journalist & Author

Danny Cahill

The BIGGEST "The Biggest Loser." Lost 236 pounds in less than 7 months!

Matt Miller

Fortune Columnist, Author & Radio Host

Dr. Francis Collins

Head, Molecular Genetics Section, National Human Genome Research Institute; 16th Director, National Institutes of Health

Dr. Francis Collins: "I don't see a conflict" between science and faith ...

Dr. Zorba Paster

Physician & Radio Show Host