AJ McLean

Singer, Songwriter and member of the Backstreet Boys

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

Akbar Gbajabiamila

Inspirational Former NFL Player & Broadcaster; Host of American Ninja Warrior & Co-Host of The Talk

Alisha Marie

YouTube Fashion & Beauty Guru

Andy Puddicombe

Co-Founder of Headspace

Antonio Damasio

Director of the Brain Institute

Bar Refaeli

Israeli Model

Billie Lourd

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

Billy Bob Thornton

Actor, Screenwriter; Known for "Armageddon"

Cheryl Tiegs

Former Sports Illustrated Swimsuit Model; Proclaimed the "All-American" Model

Colton Haynes

Actor; Best Known for "Teen Wolf" & "Arrow"

Daniel Amen

Award-Winning Psychiatrist & Best Selling Author

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

Danny Trejo

Actor, Author, Activist & Restaurateur; Recovery & Intervention Counselor for Troubled Youth

Denise Richards

Actress, Former Fashion Model & Reality Star on Bravo's "The Real Housewives of Beverly Hills"

Dr. Shelley Sykes

The Happiness Guru

Dustin Hoffman

American Actor with a Career in Film, Television, and Theatre Since 1960

Eileen Davidson

"Days of Our Lives" Star & Cast Member of "The Real Housewives of Beverly Hills"

Fiona Apple

Grammy Award-Winning Singer-Songwriter, Pianist & Poet

Gabby Reece

Beach Volleyball Champion, First Female Spokeswoman for Nike, Creator of HIGHX, New York Times Best Selling Author, Model and Actress.

George Lopez

Stand-Up Comedian, Television Personality, Actor & Kidney Disease Spokesperson

Gloria Reuben

Actress, Singer, and Producer