David Miliband

President & Chief Executive Officer of the International Rescue Committee; Former UK Foreign Secretary

Russell Peters

Canadian Comedian & Actor

Twenty One Pilots

Musical Duo From Columbus, OH; Known For Singles Like "Stressed Out"

Bob Vila

Home Improvement Expert; Former Host of "This Old House" and "Bob Vila's Home Again," Among Other Shows

Drew Houston

Co-Founder & CEO of Dropbox

Pia Toscano

Contestant on the tenth season of American Idol

Astro Teller

Captain of Moonshots, Google X

Anna Gunn

Emmy Award Winning Actress Best Known for "Breaking Bad"

Andrew Lincoln

Actor; Best Known as Rick Grimes on AMC's "The Walking Dead"

Scotty McCreery

Country Music Singer and Winner of American Idol Season 10

Go Big or Go Home: The Journey Toward the Dream

Mark Harmon

Actor Known for "NCIS" & "West Wing"; Author of "Ghosts of Honolulu"

Ghosts of Honolulu: A Japanese Spy, A Japanese American Spy Hunter, and the Untold Stor...

Parmalee

Country Rock Band Known For Singles Like "Carolina" and "Close Your Eyes"

Kiefer Sutherland

Award-Winning Actor & Musician

SuChin Pak

Veteran Media Personality & TV Host

Robert M. Gates

Secretary of Defense (2006 - 2011), Former Director of the CIA

Dick Costolo

Former CEO of Twitter and Co-Founder of Feedburner

Patrick Stewart

Actor & Director; Star of the Starz Series 'Blunt Talk'

William Ury

Author, Mediator & Co-Founder of Program on Negotiation at Harvard Law School

Noel Tichy

Professor, University of Michigan; Director of the Global Business Partnership; Former Head of GE's Leadership Center

Hunter Hayes

Country Musician Known For Hits Such as "Wanted" and "Storm Warning"