John Green is the award-winning, #1 bestselling author of books including Looking for Alaska, The Fault in Our Stars, Turtles All the Way Down, and The Anthropocene Reviewed. With his brother, Hank, John has co-created many online video projects, including Vlogbrothers and the educa­tional channel Crash Course. John serves on the board of trustees for the global health non­profit Partners In Health and spoke at the United Nations High-Level Meeting on the Fight to End Tuberculosis.

John lives with his family in Indianapolis. You can visit him online at johngreenbooks.com or join the TB Fighters working to end tubercu­losis at tbfighters.org

David Levithan's many acclaimed novels include Someday, Another Day, Every Day, Two Boys Kissing, and Boy Meets Boy. His bestselling collaborations include Nick & Norah's Infinite Playlist and the Dash & Lily series (both written with Rachel Cohn) and Will Grayson, Will Grayson (written with John Green). In 2016, David was named the recipient of the Margaret A. Edwards Award for his contribution to YA literature. You can learn more about him at davidlevithan.com and follow him on Twitter at @loversdiction.