Kal Penn

Actor, Writer, Producer & Former Associate Director of the White House Office of Public Engagement

John Ratzenberger

Emmy-Nominated Actor, Entrepreneur & Philanthropist

Bill Nye

"The Science Guy"; Science Communicator, TV Presenter & Mechanical Engineer; Climate Change Activist

Retta

Stand-Up Comedian & Actress Known for "Parks and Recreation"

Thomas Middleditch

Actor, Voice Actor, Comedian, Screenwriter Known for "Silicon Valley"

Max Greenfield

Actor Known For "New Girl" & Children's Author

Mario Lopez

Actor & Entertainment Journalist

B.J. Novak

Actor, Writer & Comedian Known for "The Office"

Carol Leifer

Award-Winning Writer, Author, Actress & Standup Comedian

T.J. Miller

Actor and Stand-Up Comedian, Currently Starring in HBO's 'Silicon Valley'

Nick Offerman

Actor, Writer & Carpenter; Best Known for "Parks and Recreation"

Rob Lowe

Actor, Best-Selling Author, Podcaster & Philanthropist

Lance Gross

Actor, Model & Photographer; Best Known for "House of Payne"

Sherry Lansing

Former CEO of Paramount Pictures & Founder of The Sherry Lansing Foundation

Josh Peck

Actor & Social Media Influencer

Sophia Bush

Actress, Humanitarian & Author

Sophia Amoruso

International Public Speaker, Founder & CEO of Nasty Gal, Author of "#GIRLBOSS"

I Was A Stripper! A Shoplifter! Then Built A $400m Business!

Dolvett Quince

Fitness Guru & Trainer from "The Biggest Loser"

Dennis Prager

Host of the Dennis Prager Radio Show, Co-Founder of Prager University, NY Times Bestselling Author & Columnist

Tavis Smiley

Broadcaster, Author, Publisher, Advocate, and Philanthropist