Lena Dunham

Writer, Director, Actor & Producer Best Known for HBO’s “Girls”

Cesar Millan

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

Alfre Woodard

Emmy Award-Winning Actress; Human Rights Activist

Ty Burrell

Actor and Activist; Plays Phil Dunphy on ABC's hit show "Modern Family"

David Suzuki

Environmentalist & Scientist; Co-Founder of the David Suzuki Foundation

Denise Austin

Fitness Expert, Author & Video Hall of Famer

Jason Reitman

Academy Award-Nominated Director, Screenwriter & Producer; Best Known for His Work on "Juno" and "Thank You For Smoking"

Mandy Patinkin

Actor Best Known for "Homeland," "Criminal Minds" and "The Princess Bride"

Brad Meltzer

Host of History Channel’s "Lost History" & "Brad Meltzer’s Decoded;" New York Times Best-Selling Author

Nick Kroll

Actor & Comedian; Best Known for "Big Mouth," "Kroll Show" & "The League"

Nick Kroll Breaks Down His Most Famous Character Voices | Vanity Fair

Danny Glover

Acclaimed Actor, Producer & Leading Social Activist; Epilepsy Survivor

Danny DeVito, Danny Glover Talk 'Jumanji: The Next Level'

Kunal Nayyar

Actor Known for "The Big Bang Theory"

Graham Hill

Founder of Life Edited & TreeHugger.com

Ted Turner

Media Mogul & Philanthropist

Bo Burnham

Filmmaker, Comedian & YouTuber

Danai Gurira

Actress, Best Known for "Black Panther" & "The Walking Dead"

Kara DioGuardi

Music Industry Songwriter & Producer

Daniel Yergin

Authority on Energy, International Politics & Economics; Pulitzer Prize-Winning Author

Steve Martin

Iconic Actor, Comedian, Author, Playwright & Musician

Paula Zahn

Distinguished News Anchor & Nine-Time Emmy Award Winner