Danny Trejo

Actor, Activist & Restaurateur

Patricia Arquette

Academy Award-Winning Actress, Activist, Humanitarian & Author

Patricia Arquette's One-Year Quest to Be Brave Turned into an Acting Career

Sophia Bush

Actress, Humanitarian & Author

Simon Lovell

English Comedy Magician, Card Shark Actor and Con Man

Tamron Hall

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

Paul Snelgrove

Paul Snelgrove led the group that pulled together the findings of the Census of Marine Life -- synthesizing 10 years and 540 expeditions into a book of wonders.

Daniel Pauly

Daniel Pauly is the principal investigator at the Sea Around Us Project, which studies the impact of the world's fisheries on marine ecosystems. The software he's helped develop is used around the world to model and track the ocean.

Bella Thorne

Model, Actress & Author

Dr. Tierney Thys

Marine Biologist, Educator & Filmmaker

Ian Somerhalder

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

Rachel Zoe

Celebrity Stylist, Fashion Designer, Author, Talk Show Host of "Fashionably Late With Rachel Zoe"

Kristen Bell

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

Kristin Cavallari

TV Personality & Fashion Designer

Lisa Vanderpump

Entrepreneur, TV Personality, Author & Philanthropist

Gabriela Cowperthwaite

Director, Writer & Producer; Best Known for the Documentary "Blackfish"

Dyan deNapoli

Penguin Expert, TED Speaker & Award-Winning Author of "The Great Penguin Rescue"

Alan Cumming

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

Michael Archer

Paleontologist Michael Archer is working to bring back his favorite extinct animal: the Tasmanian tiger.

Jennifer Lopez

Actress, Recording Artist, Dancer & Philanthropist; Known by the Nickname "J. Lo"

Rachelle Lefevre

Rachelle Lefevre is a Canadian actress. She played the vampire Victoria Sutherland in the first two films of the Twilight saga