Bill Nye

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

Ben Stein

Political Economist, Commentator, Author & Actor

B.J. Novak

Actor, Writer & Comedian Known for "The Office"

Sophia Bush

Actress, Humanitarian & Author

Ashley Judd

Actress, Activist & Humanitarian

George Takei

Actor, Social Justice Activist & Social Media Mega-Power

Spike Lee

Academy Award-Winning Writer, Producer, Actor & Director; Best Known for "BlacKkKlansman" & "Malcolm X"

Viola Davis

Academy Award-Winning Actress, Producer & New York Times Best-Selling Author

Viola Davis on Speaking Up, Challenging Stereotypes

Ian Somerhalder

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

Aasif Mandvi

Comedic Actor & Former Correspondent for "The Daily Show"

Bill Hader

Actor, Comedian, Writer, & Director; Known for "Saturday Night Live" & "Barry"

Seth Meyers & Bill Hader's Favorite SNL Memories & Barry Finale

Retta

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

Mira Sorvino

Academy Award-Winning Actress & United Nations Goodwill Ambassador on Human Trafficking

Rita Moreno

Award-Winning Actress, Dancer, Singer; Health Advocate & New York Times Bestselling Author

Kate McKinnon

Emmy Award-Winning Comedian & Former Cast Member of "Saturday Night Live"

Kevin Bacon

Actor, Musician, Founder of Sixdegrees.org

Max Greenfield

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

Jay Pharoah

Actor, Stand-Up Comedian & Impressionist; Former Saturday Night Live Cast Member

Kevin Spacey

Two-Time Academy Award-Winning Actor, Director, Producer, Screenwriter and Singer; Best Known For His Roles in "American Beauty" and Netflix's "House of Cards"

Vince Gilligan

Creator, "Breaking Bad" & "Better Call Saul"