John Green

New York Times Bestselling Author, Known for "The Fault in Our Stars," "Looking for Alaska" & "Paper Towns"

Drew Houston

Co-Founder & CEO of Dropbox

Annie Lennox

Singer-Songwriter Known for "Sweet Dreams;" Political Activist & Humanitarian

Darius Rucker

Lead Singer and Rhythm Guitarist of the Rock Band Hootie & the Blowfish

Cal Ripken, Jr.

President & CEO Ripken Baseball, Inc.; Baseball "Ironman" and Legendary Shortstop from the Baltimore Orioles

Ripken says he's cancer-free after March surgery