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"

Spike Lee

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

T.J. Miller

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

Aasif Mandvi

Comedic Actor & Former Correspondent for "The Daily Show"

Aasif Mandvi Shares How Fatherhood Saved Him from FOMO

Bill Hader

Actor, Comedian, Writer, Producer, Director, Known for "Saturday Night Live"

Retta

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

Retta Shares the Ugly Sides of Filming HGTV's Ugliest House in America

Josh Radnor

Actor, Director, and Co-Star of the Hit CBS sitcom, "How I Met Your Mother"

Maysoon Zayid

Palestinian-American Actress, Writer, Comedian, Disability & Anti-Cyber Bullying Advocate

Kate McKinnon

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

Gabby Douglas

First African-American to Win Olympic Gold Medal for Gymnastics; Author of New York Times Bestseller "Grace, Gold & Glory: My Leap of Faith"

Tavis Smiley

Broadcaster, Author, Publisher, Advocate, and Philanthropist

Jay Pharoah

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

Max Greenfield

Actor Known For "New Girl"

Rob Riggle

Actor, Comedian, Writer, Producer, Director & Former U.S. Marine

Nikki Glaser

Stand-Up Comedian & Podcast Host; Known for "Last Comic Standing" and "Inside Amy Schumer"

Tom Cotter

Comedian and Breakout Star from "America's Got Talent"

Nick Offerman

Actor, Writer and Carpenter; Best Known for his Breakout Role as Ron Swanson on "Parks and Recreation"

William Shatner

Emmy-Award Winning Actor, Known for "Star Trek" & "Boston Legal"

Boldly Go: Reflections on a Life of Awe and Wonder