Adrian Grenier

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

Alex Honnold

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

Alfonso Ribeiro

Host of America’s Funniest Home Videos, Actor, TV Director, Award-Winning Dancer & Broadway Star

Alice Waters

Executive Chef, Founder & Owner of Chez Panisse; Sustainable Agriculture Advocate

Alyssa Milano

Actress, Author, Philanthropist & Founder of Touch by Alyssa Milano; Known for "Charmed" and "Who's the Boss"

Amy Smart

Actress, Environmentalist & Co-Founder of Smart House Collections

Animal Collective

Experimental Psychedelic Band Known for Standout Albums Like "Merriweather Post Pavilion"

Animal Collective - Car Keys (Gregg Turkington Remix) (Official ...

Anna Paquin

Actress Best Known for "True Blood" and for the X-Men Franchise

Belinda Carlisle

Grammy Award-Nominated Singer; Known for the Hit "Heaven Is a Place on Earth"; Former Lead Vocalist of the Go-Gos

Bill Maher

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

Brad Pitt

Actor, Producer, Philanthropist & Environmental Activist

Carrie Ann Inaba

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

Cesar Millan

Host of The Dog Whisperer; Author of Cesar's Way

Charlize Theron

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

Chrissie Hynde

Singer, Songwriter, and Musician; Best Known as the Lead Singer of the Rock Band "The Pretenders"

Christian Bale

Academy Award Winner Actor Best Known for the "Dark Knight" and "The Fighter"

Christiana Figueres

Expert on Global Climate Change; Former Executive Secretary of the UN Framework Convention on Climate Change

Dao Nguyen

Publisher at BuzzFeed

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"