Dr. Michio Kaku

World-Renowned Futurist & Theoretical Physicist

Steve Wozniak

Co-Founder of Apple Computer, Inc.

Lisa Ling

Award-Winning Journalist & Producer for CBS News

Lisa Leslie

WNBA Champion, Olympic Gold Medalist & Author of "Don't Let the Lipstick Fool You;" Coach of Ice-Cube's BIG3 Basketball League

Ben Stein

Political Economist, Commentator, Author & Actor

Montel Williams

Emmy Award-Winning Talk Show Host; Multiple Sclerosis Survivor; Health Equity & Veteran Advocate

John Legend

EGOT Winning Musician, Producer & Philantropist

B.J. Novak

Actor, Writer & Comedian Known for "The Office"

Sophia Bush

Actress, Humanitarian & Author

George Takei

Actor, Social Justice Activist & Social Media Mega-Power

Amy Purdy

Former "Dancing with the Stars" Contestant & Paralympic Professional Snowboarder

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'

Viola Davis

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

Viola Davis on Speaking Up, Challenging Stereotypes

Dean Kamen

Founder of FIRST; President of DEKA Research & Development Corporation

Jimmy Wales

Founder of Wikipedia & Wikitribune

Anne-Marie Slaughter

Foreign Policy Expert, Author & CEO of New America Foundation

Joe Scarborough

Co-Host of MSNBC's "Morning Joe" & Former U.S. Congressman

Ian Somerhalder

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

Bill Hader

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

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