Johann Hari

Journalist & Best-Selling Author of "Chasing the Scream"

Magic Pill: The Extraordinary Benefits and Disturbing Risks of the New Weight-Loss Drugs

Billie Lourd

"Booksmart" and "Scream Queens" Actress, Daughter of Carrie Fisher

Lily Collins

Actress, Model & Author Best Known For "Emily in Paris"

Lily Collins - Vogue Scandinavia

Selma Blair

Actress; Multiple Sclerosis Survivor; Healthcare & Disability Advocate

Kid Cudi

Rapper, Singer & Actor; Known for "Pursuit of Happiness" & "Man on the Moon"

Daniel Amen

Award-Winning Psychiatrist & Best Selling Author

Raising Mentally Strong Kids: How to Combine the Power of Neuroscience with Love and Lo...

Elizabeth Vargas

Emmy Award-Winning Journalist; Best-Selling Author; Anchor for NewsNation

Rich Roll

Athlete, Wellness Advocate, Motivational Speaker, Addiction Survivor & Author

Glenn Beck

Political Commentator; Television Producer & Radio Host of "The Glenn Beck Program"

Dennis Quaid

Actor / Patient Safety Advocate

Mike Tyson

Former Boxing Heavyweight Champion; Entrepreneur & Philanthropist

AJ McLean

Singer, Songwriter and member of the Backstreet Boys

AJ McLean Opens Up About His 20-Year Drug Addiction Battle ...

Tom Hardy

English Actor Known for "This Means War," "The Dark Knight Rises," "Inception." & "Mad Max"

Alice Cooper

American Rock Singer-Songwriter; "Poison"

John Larroquette

Emmy Award-winning actor best known for his role as Dan Fielding on "Night Court"