Demi Lovato

Grammy Nominated Singer-Songwriter, Musician, Philanthropist & Mental Health Advocate

John Cena

WWE Professional Wrestler, Bodybuilder, and Actor Known for "Trainwreck"

Arnold Schwarzenegger

Actor, Producer, Director, Writer; California’s 38th Governor; Host of "Celebrity Apprentice"

Gabrielle Union

Actress, Voice Artist, Activist, Author & Investor

Brooke Shields

Actress; Model; Women's Health, Aging & Mental Wellness Advocate

Howard Schultz

Executive Chairman & Former CEO of Starbucks; Former Owner of the Seattle SuperSonics

Bill Maher

Political Satirist & Host of HBO's "Real Time"

Natalie Portman

Award-Winning Actress Known for "Black Swan," "V for Vendetta" & Playing Padmé Amidala in the Star Wars Prequel Trilogy

Natalie Portman on self-confidence and performing from an early ...

Malala Yousafzai

Youngest-Ever Nobel Prize Winner; Advocate for Girls' Education & Women's Equality; Author of the International Bestseller "I Am Malala"

Rosie O'Donnell

Comedian, Actress, Author & Television Personality

Deepak Chopra

Co-Founder of The Chopra Center for Wellbeing

Issa Rae

Actress, Writer, Director & Producer Known for HBO's "Insecure" & "Awkward Black Girl"

Joseph Gordon-Levitt

Founder of HitRecord & Actor Known for "Inception" & "The Dark Knight Rises"

Marlo Thomas

Emmy Award-Winning Actress, Social Activist & Presidential Medal of Freedom Recipient

Stephen A. Smith

Sports Journalist, Analyst & Talk Show Host Known for "First Take"

Soledad O'Brien

Award Winning Journalist, Documentarian, News Anchor, Producer, Entrepreneur & Philanthropist

Laila Ali

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

Rachael Ray

Chef, Cookbook Author & Television Host Known for the "Rachael Ray Show"

Anne Wojcicki

Co-Founder & CEO of 23andMe

Amy Schumer

Award-Winning Actress & Comedian; Author of "The Girl with the Lower Back Tattoo;" Feminist Advocate

Amy Schumer diagnosed with rare health disorder: ‘Something was wrong’

Brittany Snow

Actress, Producer, Director, Singer & Co-Founder of Love Is Louder

Ross Mathews

Host of Hello Ross! & Author of "Man Up: Tales of My Delusional Self-Confidence"

Olivia Holt

Actress & Singer

Susan Sarandon

Academy-Winning Actress & Activist

Greg Gutfeld

Political Satirist Known for "The Greg Gutfeld Show" & "The Five."

Lily Tomlin

Actress & Comedian; Star of Netflix's "Grace and Frankie"

Nina Dobrev

Canadian Actress & Model; Best Known for "The Vampire Diaries" and "Degrassi"

Rachel Botsman

Trust Expert, Lecturer at Oxford University & Author of "Who Can You Trust?"

Dambisa Moyo

Global Economist, Author & Investor in the Future

Ice-T

Rapper, Record Producer & Actor Known for "Law & Order: SVU"