Adrian Grenier

Actor Known for HBO's "Entourage"; Environmental Activist; UN Ambassador

Aidan Gallagher

Actor, Musician & UN Environment Goodwill Program Ambassador; Known for "The Umbrella Academy"

Aidan Gallagher On 'The Umbrella Academy' and His Music | Seventeen

Alex Honnold

Professional Rock Climber & Star of the Academy-Award Winning Documentary "Free Solo"

Brad Pitt

Actor, Producer, Philanthropist & Environmental Activist

Carey Mulligan

Award-Winning Actress Known for "The Great Gatsby" & "Promising Young Woman"

Carrie Ann Inaba

"Dancing with the Stars" Judge, Founder of Carrie Ann Inaba Animal Project

Charlize Theron

Academy Award-Winning Actress; Best Known for "Monster" & "Mad Max: Fury Road"

Darin Olien

Co-Host of Netflix "Down To Earth" with Zac Efron, Best-Selling; Original Formulator of "Shakeology;" Healthy Living & Superfoods Expert

David Duchovny

Actor, Writer & Director Known for "The X-Files," "Aquarius" & "Californication"

Edie Falco

Actress, Known for "The Sopranos" & "Nurse Jackie"

Ellen DeGeneres

Award-Winning Comedian, TV Host, Actress & LGBTQ Activist

Glenn Close

Actress & Advocate

Holly Branson

Chair of Virgin Unite at Virgin & Co-Author of "WEconomy: You Can Find Meaning, Make A Living, and Change the World"

January Jones

Actress, Spokesperson for Oceana & Model, Best Known for her Role in "Mad Men"

Jim Breyer

Founder & CEO of Breyer Capital

Joe Tessitore

Play-by-Play Commentator, Studio Host

Ken Salazar

United States Ambassador to Mexico; Former Secretary of the U.S. Department of the Interior

Kristen Bell

Actress & Film Producer; Known for "Veronica Mars" & "Frozen"

Laura Dern

Actress, Director, Producer & Activist

Neville Isdell

Former CEO and Chairman of Coca-Cola