Kristin Bauer van Straten

Best known as Pam on HBO's "True Blood"

John Fulton

Host of "Must Love Cats" on Animal Planet; Actor and Musician

Dave Salmoni

Animal Planet Television Personality & Large Predator Expert

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.

Theo Rossi

American Actor & Producer; Best Known for "Sons of Anarchy" and Marvel's "Luke Cage"

Lauren Shuler Donner

Producer; Best Known for the X-Men Series

Pierce Brosnan

Actor, Producer & Activist; Best Known for His Role as James Bond

Matt Damon

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

Daryl Hannah

Actress, Best Known for "Kill Bill" & "Splash"; Environmental Activist

Charlize Theron

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

Brad Pitt

Actor, Producer, Philanthropist & Environmental Activist

Amy Smart

Actress, Environmentalist & Co-Founder of Smart House Collections

Tricia Helfer

Actress, Model, Producer, Philanthropist, Pet Advocate

Kelly Wearstler

Interior and Fashion Designer

Willie Smits

Trained Forester, Microbiologist, Conservationist, Animal Rights Activist, Wilderness Engineer & Social Entrepreneur

Terri Irwin

Naturalist, Author & Owner of Australia Zoo; Former Star of "The Crocodile Hunter"

Mickey Rourke

Maggie Q

TV & Film Actress, Known for Lead Role in CW's "Nikita"

Lisa Edelstein

Actress, Director, Writer & Producer

Kristin Cavallari

TV Personality, Fashion Designer, Bestselling Author & Founder of the Lifestyle Brand Uncommon James

True Comfort: More Than 100 Cozy Recipes Free of Gluten and Refined Sugar: A Gluten Fre...

Famke Janssen

Actress Best Known for the "X-Men" Film Series, "Nip/Tuck" and "Taken"

Eric Stonestreet

Actor & Comedian, Best-Known for "Modern Family"

Eric Roberts

Actor Known for his Roles in "Runaway Train," "The Dark Knight" and "Heroes"

Autumn Reeser

Known for her Roles in "The O.C.," "Entourage," "Necessary Roughness" & "Hawaii 5-0"

Emmylou Harris

Country Singer-Songwriter; 12-Time Grammy Winner

David Backes

Kevin Conway

Actor and director, known for One Life to Live (1968), Invincible (2006) and The Quick and the Dead (1995)

Pink

Singer-Songwriter, Actress, Philanthropist & Environmental Activist

Victoria Stilwell

Internationally Renowned Dog Trainer & Host of "It's Me or the Dog"

Moby

Musician, DJ, Photographer