Kal Penn

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

Ian Morris

Jean and Rebecca Willard Professor of Classics and Professor of History

Nev Schulman

Producer, Actor, Photographer & TV Host Known for MTV's "Catfish: The TV Show"

Shawn Achor

Harvard Professor, Researcher, Positive Psychology Expert, Author of "The Happiness Advantage" & "Big Potential"

Jenn Lim

CEO, Founder, Best-Selling Author & Global Workplace Expert

Giuliana Rancic

Entertainment Journalist & Breast Cancer Survivor

Dr. Bernice King

Minister, Attorney, Author & Daughter of Dr. Martin Luther King Jr.

Simon Schama

Professor of Art History and History at Columbia University in New York

Ben Kaufman

Head of Product Labs, BuzzFeed, Founder, Quirky & Mophie

Mark Ballas

Dancing with the Stars Champion & Mental Health Activist

Benjamin Zander

Conductor of the Boston Philharmonic Orchestra; Celebrated Leadership & Performance Expert

How to Live a Life of Possibility | Benjamin Zander - YouTube

Nick Swardson

Actor & Stand-Up Comedian Known for "Just Go With It," "Grandma's Boy" & "Reno 911"

J.R. Martinez

Actor, Best-Selling Author, Motivational Speaker, Advocate & Wounded U.S. Army Veteran

Phil Donahue

Creator and Host of "Donahue," the Long-Running Talk Show

Josh Radnor

Actor, Filmmaker, Author & Musician Best Known for his Role in "How I Met Your Mother"

Choosing Between Growth or Depth As A Man - Josh Radnor

Thomas Middleditch

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

Kristen Kish

"Top Chef" Host & Season 10 Winner; Cookbook Author

Mario Lopez

Actor & Entertainment Journalist

Maya Lin

Artist; Architect & Memorial Designer

Lance Gross

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