Aaron Huey

National Geographic Photographer & Stanford School Global Ambassador

Adrian Grenier

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

Alan Cumming

Emmy-Winning Actor Who Stars in "The Good Wife"

Alex Schulze

Co-Founder & CEO of 4ocean; Advocate for Ocean Cleanup, Conservation & Sustainability

Conversation with Alex Schulze, CEO and Co-Founder of 4ocean

Alexandra Cousteau

Environmental Activist, Storyteller & Ocean Advocate

Alexandra Horowitz

Professor of Psychology, Animal Behavior, and Canine Cognition; Bestselling Author of "Inside of a Dog: What Dogs See, Smell and Know"

Alexis Nikole Nelson

Wild Food Maker at BlackForager; TikTok Sensation

Alice Waters

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

Alicia Silverstone

Actress & Animal Rights Activist

Alison Victoria

Interior Designer; Host of HGTV's "Kitchen Crashers"

Alyssa Milano

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

Ami Vitale

Photojournalist for National Geographic Magazine & Nikon Ambassador

Amy Smart

Actress, Environmentalist & Co-Founder of Smart House Collections

Andy B. Casagrande

National Geographic Cameraman

Annie Griffiths

Award-Winning Photographer for National Geographic

Austin Stevens

Wildlife Photographer, Filmmaker & Author Best Known for Hosting a Series of Snake Documentaries

Ayana Elizabeth Johnson

Marine Biologist, Conservation Strategist, Founder & CEO of Ocean Collectiv

What If We Get It Right?: Visions of Climate Futures

Benjamin Mee

Owner of Dartmoor Zoo and the author of 'We Bought A Zoo'; his book has been made into a Hollywood Blockbuster

Beth Stern

Television Personality, Actress, Model and Wife of Howard Stern

Bindi Irwin

Wildlife Conservationist & Daughter of Steve Irwin; Season 21 Contestant on "Dancing With the Stars"