Dr. Michio Kaku

World-Renowned Futurist & Theoretical Physicist

Alice Waters

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

Ellen DeGeneres

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

Sophia Bush

Actress, Humanitarian & Author

Tim Gunn

Fashion Icon, Former Co-Host & Mentor of "Project Runway"

Matt Damon

Actor, Screenwriter & Producer; Co-Founder of Water.org; Expert Advocate on Global Water & Sanitation Crisis

Jillian Michaels

Leading Fitness Expert, Certified Nutritionist, Renowned Life Coach & Powerful Entrepreneur

Adrian Grenier

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

Rachael Ray

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

Mark Ruffalo

Actor, Director, Producer, Screenwriter & Environmental Activist

Laura Dern

Actress, Director, Producer & Activist

Tamron Hall

Award-Winning Journalist; Former National News Anchor for NBC News; Host of the "Tamron Hall Show"

Watch Where They Hide

Kesha

Pop Singer Known For "Tik Tok," "Your Love Is My Drug" & "Praying"

Bill Maher

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

Gary White

CEO & Co-Founder of WaterEquity & Water.org with Matt Damon

Moby

Musician, DJ, Photographer

Christiana Figueres

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

William McDonough

Renowned Architectural Designer, Advisor & Co-Author of "Cradle to Cradle + The Upcycle"

Alex Honnold

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

Ian Somerhalder

Actor Known for "The Vampire Diaries"; Animal & Environmental Advocate; Founder of The Ian Somerhalder Foundation