John Green is an award-winning, New York Times bestselling author whose many accolades include the Printz Medal, a Printz Honor, and the Edgar Award. With his brother, Hank, John is one half of the Vlogbrothers (youtube.com/vlogbrothers), one of the most popular online video projects in the world. You can join John's 1.1 million followers on Twitter (@realjohngreen) or visit him online at johngreenbooks.com and fishingboatproceeds.tumblr.com. John lives with his wife and son in Indianapolis, Indiana.

David Levithan (davidlevithan.com) is a New York Times bestselling and award-winning author of many books for teens, including Boy Meets Boy and (with Rachel Cohn) Nick and Norah's Infinite Playlist. He is also an editorial director/VP at Scholastic US, where he founded their Push imprint.